Slimy ATO and RO water ??

[scherzo]

I used to have slime. in my ATO.

I now have a tight lid to stop anything from falling into the tank and I also bleached and rinsed the 10 gallon ATO tank and all of the things that touch the water.

This seems to keep things at bay.

My ATO has a float switch that is attached to my RO/DI unit. I turn it on when I have about 1/4 of the tank left so that I don't have the problem of really short bursts of making water.

I have a powerhead which I also sterilized that runs when my ATO pump turns on. This helps keep things moving.

Have you checked the TDS of your ATO water? I try and put 0 TDS water into my tank for ATO water.

Having said all of this, when I was putting in slime water in my tank I didn't have any NEW problems. Even after I improved the quality of water I used I still had an GHA problem.