Hello hydo growers,
i use a 55 gal. drum with a 2ish gal. res. ph is always around 6ish.

but i'm getting the slim build up...so i'm wondering about filtration ?

Everybody keeps reefering about RO ? what is that ?

thanks
Sid Zeffer
Zeffer Reviewed by Zeffer on . Tap vs Filtered Water I have general question between the waters. I know filtered water is just what I said filtered, but I still have to ph it down to get it right level. Cant I just do it the same with tap water or does tap water have to much other chemicals that can damage the babies. :jointsmile: Rating: 5