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I basically had this same question about 6 months ago. I was running full zeovit. These days I don't think it's hard to achieve a ULNS. You don't need zeolites and a reactor to achieve that. But I started to question why I was running zeo in the first place. All these great tanks are running nutrients. Why am I paying all this money to take nutrients away and add it back in? (pohls has a lot of nitrate in it.). I decided to wean off the stones. Slowly decreased the flow through the reactor, threw in a bunch of siporax, started a fuge, and dosed nopox instead of Zeostart. Haven't looked back since.
I think it's pretty common to have elevated phosphate and no nitrate with zeo. You basically need to have it on just the right balance, where there is enough nitrate is present after zeolite, to be taken up with phosphate with carbon dosing. You could decrease the flow through the reactor, have on-off time, or start dosing potassium nitrate. Good luck!
I think it's pretty common to have elevated phosphate and no nitrate with zeo. You basically need to have it on just the right balance, where there is enough nitrate is present after zeolite, to be taken up with phosphate with carbon dosing. You could decrease the flow through the reactor, have on-off time, or start dosing potassium nitrate. Good luck!