Id like to stretch it out over a week but it never takes that long for me. Ill be testing every day. Possibly twice a day to make sure it doesn't drop to fast. I added a ball valve to the reactors and slowed it as best I could while still keeping the gfo tumbling slightly.With ur po4 currently at .24, what's your timeframes to drop it to .07? I'm picking brains before I pull the trigger. Right now I just have a bag of carbon and a bag of phosguard on the drain compartment. I figured the gentle swirling in there is just about perfect to run the bags in.. almost like a reactor.