Why does mold keep coming back?

Tried getting rid of mold but it keeps coming back each time? This video will give you a rundown of what could be causing it and the steps you can take to prevent its return.
realtimelab.com/product/envir...

[@crystalclarke6692]

i had a mould inspector but he didn't really sort the problem he allowed me to do it, so far what I've been doing hasn't worked i mean i, ve used mould spray, I did was hoping it didn't come back but it has,

[@justinransburg5560]

I'm having the same issue.