How long can I store saltwater after mixing? | BRStv Investigates

Want to know how long you can actually store your mixed saltwater in your saltwater storage tank without having to worry about losing the parameters for alkalinity and calcium ? Today on BRStv Investigates we find out what happens to saltwater after it’s been mixed and stored for upwards of three weeks !
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Today on BRStv, we have a brand new episode of our series, BRStv Investigates. In this series, we explore popular reefing theories, products, methods, and what the manuals are missing, with a focus on putting them to the test! Stay tuned as we explore even more reef fantasies and reef certainties as we try to dive into common hobby questions and challenge long held ideas in order to make this hobby even more fun and easy!
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The purpose and content of this video is to provide general information regarding the products and their applications as presented in the video. Aquatic sales solutions, inc. And its officers, directors, employees and agents disclaim all express or implied warranties, in any way, related to the products and their application as presented in this video, make no representation or warranty regarding the products and the application as presented in this video and shall not be liable for any direct or indirect losses or damages of any type, including but not limited to punitive damages, or from personal injury or death resulting from or in any manner related to the video, and the products in and contents of the video. The viewer expressly agrees that aquatic sales solutions, inc. And its officers, directors, employees and agents shall not be liable for any damages or losses related to the products in and content of the video and hereby agrees to hold the foregoing harmless from any such losses or damages.

[@dmvreefer817]

Every time I have a question you guys have a video to answer it. You guys are one of the greatest resources in this hobby. Thank you for all you do.

[@chrislovato9451]

Ditto I do not even have a tank anymore after a fire 3 years ago but I have still watched every video since to stay updated on hobby changes, buying a new house next year and looking forward to setting up a new tank

[@pedrovfg]

They are almost the best ,if they start international shipping then they are the number 1 😁

[@Njwobrien]

Yes!!!

[@thejunior9303]

Great video content! Sorry for butting in, I would appreciate your initial thoughts. Have you heard the talk about - Proutklarton Protecting Aqua Plan (search on google)? It is an awesome one of a kind guide for getting prepared for a mega drought minus the normal expense. Ive heard some extraordinary things about it and my old buddy Taylor finally got excellent results with it.

[@edwinggomez9986]

You’re doing god’s work.

[@BigGuyAl007]

Nice work again, maybe a longer test is needed and see what happens in 6-8 weeks of storage! So we know how long it really lasts for with no heat or flow. Cheers BRS, your like the marine hobby bible!

[@saltwaterpiff548]

Always coming through with the useful information. Thanks guys!

[@Njwobrien]

I'm about to start my first 70L marine tank (I've done freshwater planted tanks, large and small) and this channel is unbelievably helpful! You guys rock.

[@normrubio]

I really appreciate these test vids. Thank you for them!

[@davidvaughan3771]

I’ve always go cheap with reef crystals, glad to see their still descent, something I should have known because my tank hasn’t had issues,

[@evanfrancis3827]

Awesome video, answered several questions I’ve had for a long time

[@jimjestude7454]

Really awesome information I always wondered about! Thanks!

[@SoCo_Surfcasting]

Absolutely crucial! Great test guys. I found out the hard way that RSCP cannot be stored longer than a day or two while heated and circulated.

[@davidvaughan3771]

Best episode yet.. something we really can use, thank you!

[@andressuarez4147]

You are doing a magnificent job. Thanks for the info. I am very pleased with the IO results.

[@lovermansmith9082]

Great video ! Looking forward To the next big Test ! Ever since I 's was a baby I' s always be wondering

[@theloneaquarist]

Great topic. Thank you for exploring this question.

[@Trenton.D]

Interesting info! As someone who's taken several statistics at the PhD level, I like how you guys actually plan out the experiments in a logical manner with CLEAR and SIMPLE questions that are TESTABLE (even statistically testable, if you wanted to), and are careful about not making inferences about the results outside of the context of the experiment (thought the time points should be represented as equally spaced). Obviously would be great to have tried different lots of each brand but that's expensive and uses a lot of materials.

[@E46G0D]

I always wonder this, thanks for the research!

[@reefjunkie9018]

Great info ! Thanks

[@CalebChapman12]

Looking forward to the next one!

[@PoopyButt7]

You guys are amazing!!!!

[@thepassionreef]

Great episode once again and thank you for doing this for us hobbyists. It would be great if you guys can include Aquaforest Reef Salt in this episodes as well just a thought. Thanks.

[@sirgreybat5954]

That sure explains a lot! I have used Red Sea Coral Pro salt for years and have always mixed a batch on Friday for use the next Friday. I think I may have to rethink my approach to mixing and storage (or switch salt mixes). Thanks for the very informative video - keep up the good work!

[@LordBonesaw]

Basically mix it till it’s dissolved and chuck it straight in otherwise you lose all the good minerals when left mixing to long and has no benefits when left

[@jamesparrott2073]

Thanks guys

[@devcicero]

Thank you very much for doing these tests!

[@Cam-dy2ji]

I used io reef crystals for yearrrrs but recently switched to red sea coral pro and I'm sold on it after a couple months 100%. You definitely cannot store it for long, it builds up a crud but if used the day after it's great. My fish and corals instantly approve 😁👍

[@bocram523]

Thx for all of your videos( I think)!? Ever since I started watching, my life has changed. You can’t see the bottom of my pool because of the great algae growth in it. I have not mowed my lawn and have pile of letters from the HOA. My wife doesn’t even bother me to fix anything on the house any more, as a matter of fact, I haven’t seen her in nearly 2 weeks. I don’t know if that is because I stare in to my aquarium for hours on end, or she has moved out. I guess since I don’t have any money to go to dinner and a movie now or even want to. Yep I just looked, her closet is empty. The time I save now not having to wash her car, I can now spend making water changes. I am certain I will get fired if I leave early one more time from work because I have to see the new shipment of corals before anyone else can see them fresh out of the box. But, I have that covered, I already gave them my application to work there. Of course I will have to downsize my house and truck but get a bigger aquarium. I am hooked Thanks again. Lol P.S. if anyone has pictures of my wife please send to me, the corals I know have erased my memory. And baby if you happen to read this. I am just joking, I am not downsizing my truck

[@maverickreefer3255]

Thanks guys! 😉

[@joeymerrell8585]

I've been using red sea blue and coral pro and I love them. But after this i may try a bucket of the brightwell. It seems very stable

[@chastjw71]

Great info as always. How about a video on mixing/storage stations. both ends of the spectrum as a basic home owner station and an extreme gear junkie station. Very curios about your retractable hose, water delivery set up you have. where'd you get it, and how easy was it to change out the hose and connections to reef safe material etc. thanks again for all the great info, keep up the good work.

[@mattnaranjo7651]

Time to make bigger batches of saltwater, been waiting for this info.

[@radiantreefs305]

Thanks for this, I have red sea pro but dont store, will probably in the future and now know I would have to change brands if so...

[@KlimovArtem1]

Wow, that’s very useful information, because I’m using Red Sea Coral Pro. And I’ve switched from Reef Crystals. Looks like Reef Crystals is not that bad at all!

[@trureef2319]

Guy turns to his coworker who uses Red Sea over Instant Ocean and says “your salt sucks lol”.

[@mc3newsmcocconcierge504]

Hahaha! This video feels good watching since I’ve been called “cheap” for using reef crystals.

[@westgate1208]

Lmao

[@kiddt1999]

@@mc3newsmcocconcierge504 any issue with a brownish residue?

[@mc3newsmcocconcierge504]

To those who say I’m cheap using reef crystals, told you!

[@karennation3580]

haha. I just cant see paying so much more! Didint relize the calcium is so high, explains why I dont have to dose so saving even more money:(

[@madusonkeeper]

Wow good to know!

[@krishnar1182]

Would you expect Fritz regular and high alkalinity salt mixes to be closer to any one of the tested mixes in particular? Thanks again for another great informative video!

[@solarchuva7042]

Would be nice if next time let it for more weeks and also do the same with natural sea water measuring NO3 and PO4 for we see how the decay or living organisms afect the parameters while in a storage bin. Super thanks to bring science always.

[@karennation3580]

Wow, I realize i have been possibly doing alot of things wrong. I have only stoped heating the ro water since summer since I live in florida but I just pour it straight in without testing the temp and red sea says mix at 65 degress which sounds insane to me! But does make me wonder if the water is much cooler than I though but doubtful since it is stored in a hot garage. Some of it is premixed or I have one ro container I leave in house so since I keep indoor temp about 78 it should be good. By the touch it feels good and occasionally I have checked the thermometer in tank. I use reef crystals by IO since its by far the cheapest but had no idea its so elevated. I knew it said elevated but I thought that was that the other mix was maybe fish only but 500 is pretty high. Could this be dangerous for my tank and corals? Wondering if I should switch. I dont dose and change water weeky and dont check calcium that often(but will now) seems its usually 440 or something and dkh is usually 9 .3 or 4. Should I keep the alk at exactly the same level, is it okay to vary a few points as long as its in the 9"s? Kind of new at this game!

[@artursm15]

Just wondering how would it affect it if it would be stored heated and some circulation?? And could you include aquaforest reef salt in your tests ??? Thanks for great work guys ..

[@tomclarke9390]

Can you add ph numbers in this test though? Pretty crucial for us nano guys. Thanks.

[@cagive24]

Definitely the best reefing channel on KZbin keep up the good work😏 it's a shame you don't do sipping to the UK the shop here are no where as good as the us did try to buy loads from you website to realise you don't shipping to the UK absolutely gutted do you think they will change it in the near future?

[@cagive24]

that great new will definitely be order from you guys if that happens 😏 I spend hours listening to your videos on KZbin when at work and at home so being able to purchase your products would be amazing thank for the reply keep up the good work 👍

[@taherk77]

BRS should do a whole tutorial with Aqua forest products with a SPS tank. Demonstrate all Aqua forest tanks like NP pro, salts etc. Some aqua forest tanks really do great

[@spikelee2887]

in storage do you constantly keep it mixing with a power head or do you mix it a few hours, store it, then remix it before use?

[@candykanefpv98]

The biggest problem would be salinity which if that swings will cause precipitation.

[@SNBI2A]

I have been using HW Marinemix for 4 month now since the new system received water. I tested alk, Cal and mag for the first time last week as I'm planning on trying some test corals soon. I was shocked to see alk was at 6dkh when my target was 9. I tested my saltwater mixing container and it tested at 6dkh. I dumped the water and started a new batch. It was spot on at 9dkh. I'm going to test every other day to find the drop off point. However I do believe HW Marinemix is dropping at some point. I have also found other threads confirming the same. I do use a strong power head and heater. Question if I had 10 gallons left of sw and added 30 gal of fresh water to the 10, then added salt could this be affecting the dkh and Cal? Cal was also low by 50ppm. 450 is what I should be getting but redsea found it at 400.

[@RG-1971]

Nice video randy! Any reason to think the tropic Marin bioactif would be different than the two you tested??

[@peterclark85]

I believe that one is recommended to be used right away only.

[@lovermansmith9082]

Maybe test that purple up coraline algae stuff . Ryan got bugs once seeding from another tank

[@pastieboi69]

Great video! But when will you have a distributor in the uk?.... I’m sure with your reputation that it would be a great international business, Happy to talk about a franchise deal 😉 wink wink

[@passissmokes1034]

Damn, I just switched my 40 gallon tank to Red Sea Coral Pro...going to take a long time to finish that bucket. Wish this was sooner, oh well next time I'll buy reef crystals so I can store the saltwater for 3 weeks.Great vid!

[@passissmokes1034]

@@BRStv ok awesome will be following

[@matyas4878]

Please make a dinoflagellate video. Many people suffer from this terrible pest

[@kAi-ub8hi]

Silicate issue. No wc and let them die after consuming all silicate

[@timlaw1612]

@@kAi-ub8hi are you talking about diatoms or dinos?

[@FECtetra1918]

Raise your nitrates and phosphates in order to make 'regular' algae grow and outcompete the dinos. Add loads of bacteria. The kinds that utilize a wide range of organic compounds. Not nitrifying. They will also outcompete dinos. Wait.

[@CephDude]

@@kAi-ub8hi No, that would be a diatom issue. For dinos, we BELIEVE the best treatment is actually increasing no3 and Po4 in order to allow other algae and bacterias to outcompete.

[@kAi-ub8hi]

@@CephDude you are right. My bad. 😅

[@TheGreenerLawn]

Am I understanding this correctly, to do an auto water change unit, with a months worth of water, and daily water changes, I don’t have to heat it (I already believe this to be true, but I don’t have to keep mixing it beyond the first few hours? So initially mix it and let it sit stagnate while being used or do I keep mixing it all month? It sounds like mix and let sit?

[@billydanzz]

The highly rated Tropic Marin's Pro Reef salt's 7dkh is on the low side is it not????

[@2869may]

Instant Ocean was developed for the Gov.... with very high standards and requirements....

[@lancepentzer7284]

You should try keeping the power heads on so they're constantly mixing the whole time. I have made salt water and kept it for 2 months with just the the power head mixing the water in the bucket with the lid in

[@erikmonroy8257]

If i mix the ro with reef pro mix in a 5 gallon bucket and close it . Will it be good for my next water change? I have a fish only aquarium

[@rosedonnapur]

I have a 60l rodi water that I get from pet shop I take 2. 40l tanks with me so I haw water to do top up till I go pet shop agin so this was helpfull

[@brocklowe118]

How long does salt have to mix before adding to my tank. I have been told to mix at temp for 24hrs before adding to tank? Thank y’all so much!!!

[@brocklowe118]

Thank y’all so much for answering my question!

[@briancahill5916]

I would love to see this test done on magnesium levels. Since most reefers Dose Calc and Alk it would be interesting to see how the magnesium levels hold as that would be beneficial in keeping elevated levels of Calc and Alk. I use water changes as my primary form of regulating my Magnesium so possibly I need red sea pro instead of blue bucket. Great test really appreciate it!

[@raiders_and_reefs]

Glad I never changed to red sea salt mixes.

[@ThaBiznessReefTank]

So just to confirm your just mixing the salt with a power head and after mixing clear removing the power head so no circulation in the storage container?

[@gabesreef]

You are fuxking awesome

[@Blackbookproduct10ns]

Were you mixing the water while it was stored or was it sitting stagnant? Heated?

[@AJ-bi6ns]

Curious what if any impact occasional circulation has on the results. I keep my salt in a 105g drum and currently mix for 5 minutes every 6 hours

[@paulwoodley489]

Did you make a vid about heated/flow stored water? I store mine heated and circulating with TMproreef but I haven’t though to test! I have yet to witness any deposits in my container (250l) so that’s a good start. It is stored upwards of 4 weeks before I refill and remix

[@BRStv]

Yep! Here you go: kzbin.info/www/bejne/mqeYeHighdifoLM

[@MeditationMelodiessounds]

will switch from the blue bucket to neomarine red sea got to pricey now.

[@BaconSniffer578]

I’ve used reef crystals for 15 years, it’s the best.

[@davevanlier2028]

You should run the same test but keep the water heated to 78 and constantly mixing with a small powerhead to see if the results change.

[@bernienufc3166]

i Would love to know the impact on PH as i stopped storing due to the PH dropping after 24hrs with the Tropic Marin, will you be showing this in the next test?

[@bernienufc3166]

@@BRStv wow, so if i am right this was just stored with no air, no pump and no heater, need to see why mine was different now, many thanks for great videos , bernie

[@geofflee216]

Include seachem in next test please

[@joostdionne]

I am starting a 20 gallon saltwater tank. I have experience with saltwater fish and corals. What would you recomend for lifestock.

[@joostdionne]

BulkReefSupplyCom thank you

[@shaunmc1910]

How does storing it differ from putting it in the tank? If the parameters changed over time in a bucket, wouldn't you expect the same results in a tank?

[@BRStv]

What we found in our salt videos that followed this one is that heat and circulation seem to be the key for long term salt storage.

[@truereefkeeping6022]

I just recently started doing automatic water changes, I’m using the Red Sea blue bucket and mixing up a batch a week at a time, so based off this video I don’t need to worry about precipitation or anything negative?

[@BRStv]

Based on our testing, blue bucket will work just fine for AWC if you're mixing up a week's worth of saltwater at a time. Just make sure that it's fully mixed before turning off the flow in the mixing container.

[@mjs8148]

Once Coral Pro is added to a tank with high water movement and at 78 degrees F, will it start to precipitate in the tank just as it would in a storage container with a powerhead and heater? It seems like it would since the two factors which seem to cause precipitation, water movement and heat, exist in the display tank.

[@BRStv]

In our other saltwater storage tests, we actually found that flow and heat stopped precipitation from being an issue, even with the Coral Pro salts.

[@nickgialias8015]

What water storage bins do you recommend for larger systems (>50 gallon brute)?

[@BRStv]

Check out some of the water storage containers from Nowesco or Ace Roto Mold. Those are the two brands that we use in the BRS office and they can normally be found at a local farm supply store.

[@nickgialias8015]

@@BRStv Thanks!

[@drewlong77]

What's the coldest temp you think you can safely store mixed sw at? (Tropic marin) been high 60s at night & put sw bin on porch.. but dropped to 54 last night. ?

[@BRStv]

We haven't done any testing in temps quite that cool, but we have no issues storing TM Pro Reef water at room temp (about 70 degrees). I doubt you'll see much, if any, precipitation at slightly lower temps though. Of course, if you wanted to know for sure, I would test alkalinity after it's fully mixed, then again after the saltwater is allowed to hit the 50's and 60's. If you get a drop, it's pretty safe to assume that there is some calcium/alkalinity precipitation going on.

[@avatargunner6776]

Okay if you're storing RO water for your top off and you're using say a 5 gallon bucket and it takes 2 weeks for you to run out is there anything you need to do to keep your RO water from building up phosphate or algae that might go into your main tank?

[@BRStv]

If you're storing fresh RO water (no salt), then we've found that storing without heat or circulation is just fine. We store about 100 gallons of freshwater this way at any given time.

[@ikkyplays4500]

So with the Red Sea coral pro bucket you can only store this for 4 hours after mixing ? So am guessing I won't be able to set up s automatic water changing station ?

[@ikkyplays4500]

BulkReefSupplyCom that's good am glad I found this out I was looking into doing water changes from watching your videos to make things easy for myself

[@coreyorr4206]

Also I’m really confused as to why we are testing this. I figured it was a given that if a container is sealed nothing could leave the container..

[@darkestknight2063]

One question. If I have a new bucket salt keep in storage never open for 10 years. Do that salt able to use it or got any expiry date?

[@BRStv]

There isn't really a shelf life on salt mix as long as it's not all clumped up from moisture getting into the box or bucket.

[@Big-Cat27]

No Aquaforest salt .... feeling lonely here ☹️

[@moetivation2378]

What are the parameters that you strive for in a reef tank

[@LordBonesaw]

I mix my salt for 20 minutes then chuck it straight in as it can lose certain minerals if left in storage to long

[@ChrisAquatics]

Generally when I store my water I have a heater to keep the saltwater at the same temperature as my tanks. Do you guys always keep your mixed saltwater at room temperature or is it alright to keep it at 78 degrees after mixing?

[@ChrisAquatics]

Never mind I got to the end and saw you plan on looking at that further. Thanks guys!

[@ehickman713]

Just curious but what salt brand does BRS use?

[@ehickman713]

Randy R. Thank you

[@garrycole9187]

Everyone should have some stored mixed water for emergency, it has saved my a** several times. I am thinking now about reef crystals.

[@adilmak4874]

For red sea blue bucket, 3 weeks looks stable - what do you think about 8 weeks? (I'm creating an ultra low maintenance tank with AWC so interested)

[@BRStv]

We found the most stable storage from salts like Tropic Marin Pro and ESV B-Ionic salts, with little to know "crud" in the tank. Both Red Sea salts we tested did leave a precipitate crust during long term storage, meaning you will likely need to clean your salt storage bins more frequently than other salts.

[@MrGarciaJr]

@@BRStv just made the switch to the blue bucket because of the low alkalinity in tropic Marin pro. I never even had the storage drop off in mind and on top of it leaves crud. Oh no. I guess I'll have to mix up salt weekly now.

[@IanB1015]

Wish AquaForest was included

[@ceippert]

Why does my tropic marin reef pro salt water smell musty or like cat pee in the sealed brute? After a few days it smells awful

[@dhoff6386]

Im using RC...i have been seeing a drop in dkh but my water is heated at 79 and circulating....after being mixed should i stop the pump and heater?

[@ryanbatcheller394]

We will find out in a month or so :)

[@dhoff6386]

@@ryanbatcheller394 cant wait...i really look forward to the brs videos...thank you

[@danluongo1423]

So I wonder if the RS Coral Pro precipitates CA and alkalinity when heated to 77 degrees after 4-48 hours what happens to it once dumped into your tank? It's right at 77 degrees and a heck of a lot longer than 48hrs .

[@BRStv]

Based on further testing as a part of this series, it seems like as long as you have constant heat and water circulation, precipitation can be avoided with the Red Sea salts.

[@danluongo1423]

@@BRStv Thanks, appreciate your response. I'm pouring over these vids again since I'm thinking of switching salts to get a higher alkalinity. I've been using TM Pro for the past 9months since tank setup but the 7 dKh is lower than I want. The TM Classic may be my sweet spot. RS blue bucket seems to have too much of a mixing ritual.

[@ericv435]

how is it with magnesium

[@russellkeith3193]

i had my stored for for month & half now no heater pump moving water instant ocean regular should be ok?

[@BRStv]

The easiest way to check is to test your calcium and alkalinity. If they're at normal levels for your salt mix, then you should be good to go.

[@artursm15]

Finally.......

[@anamnesiser]

Its my understanding that additives in the salt mixes help with solubilization, this may explain the increase in dKH for some mixes. No problems here storing normal Ca/alk salt mixes for weeks :)

[@rrrreefer9721]

Why does red sea say to mix for 4 hours max if you proved it takes 23 hours to completely mix?

[@glennrudolph]

Anyone else notice the line was on 1.027 specific gravity

[@glennrudolph]

Hmmmm. Well I’m pretty sure I just caught a supraliminal message. If every reefer is doing monthly water changes at .001 SG more than usual, BRS could stand to make a killing!! I’m talking dozens of dollars a month!:)

[@vleis7226]

Has anybody done this on AQUA FOREST SALT?

[@karennation3580]

Wait... Uncirulated? Always heard to keep a wavemaker in the water if its mixed and I know that uncirulated saltwater gets slimy or at least the wavemaker and cords and the sides of the storage bin got slimy when my wavemaker came unplugged for a few days and had to throw it out, defietly afraid to use it if everything it touched was slimy! Are you saying we are not supposed to keep a wavemaker or sometype of circulation like pump or something in there?

[@BRStv]

This is just one video in a larger salt test. If you watch further into this playlist, you'll see that using circulation to store saltwater is actually a better plan :)

[@nekproductions3271]

@@BRStv Did you do a longer test - like weeks/months? I think you might be analyzing your data a bit incorrectly. Its true that for example the alkalinity is +- 0.5 DKH - but if this was truly 'random' variation due to testing - you would see a bumpy graph consistently ( like you do in some brands), as compared to some of the salts that have a constant rise or drop on the parameters. Likewise, there should be no salts that are 'flat'. One other thing - is that the way you change units on the graph (going from minutes - hours - weeks) without spreading out the time in the right proportion - it makes the graph potentially suggest something thats not 'real'. Thanks for the video btw - In general it does suggest there is little difference over time. If might also be interesting to know whether salt in a large tank (like 60 gallons) - is different than a smaller tank.

[@wilmacfarlane4718]

I’m a bit ‘salty’ you didn’t do Fritz too

[@ryanbatcheller394]

It’s true. We do tend to test the stuff we stock. I guess that could be perceived as negative. I’d like to think of it as we go the extra mile for our customers to share information about the products they buy from us.

[@ryanbatcheller394]

For what it is worth I get the HW reference. In this case rather than just say one salt is better than another we are attempting to share legit information so you can make your own decision on not just the salt but how to use them to achieve the desired results.

[@hammeredtravis]

Another Fritz fanboy. Hey BRS, why don't you test Morton table salt while you're at it? It's such a popular salt that tons of people use, I don't understand why you don't carry it.

[@wilmacfarlane4718]

Its just salt my guy, no need to get agro lol.

[@hammeredtravis]

Not angry, just think it's kinda ridiculous for someone to be upset that BRS didn't test a product they don't even carry. BRS only sells products they feel will benefit their customers so there's probably a reason they don't carry Fritz. Some people have had success with Fritz, but many have also had problems. My previous comment was mostly directed at the other guy, not so much you.

[@Richfxx]

What if you keep it circulating and heated

[@BRStv]

We found that if you keep your salt heated and circulated, there is no drop in calcium or alkalinity levels (within the margin of error on our test kits)

[@takoattack]

Another variable in the equation is concentration of CO2 in the air and the gas exchange between air and water. I have experienced more extreme alkalinity reduction over time using both red sea coral pro and red sea blue bucket when stored at warmer temperatures without constant mixing.