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It has come to my attention that you want .5 Micron The higher the number the bigger the hole in the micron world.
Here is .5 Micro Felt. Building instructions are the same.
www.amazon.com...
Duda Energy sheets:5u 1 yd. x 72" Singed Polyester Felt Filter
For recipes to make you own copper solutions go here
www.firstdensi...