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Not sure what PO4 export products are...I have a 7 stage ro/di filter. I tested the water before and after mixing salt, both test are 0.

I have been fighting a losing battle with phosphate levels. No matter what I do cant get them bellow .25. I have done large water changes, small water changes every couple days, reduced feeding, reduced lights etc. My Nitrate levels are ok. Not at 0 yet but getting there. Any help would be appreciat...