Gfo question
I am new to running gfo
My question is.
Is there a way to tell if gfo is spent.
My po4 was off the chart. To which I attribute my family feeding the tank twice a day. I was in aware of this so I fed in evening.
I have remedied the feeding schedule and done wc.
I know most People change gfo once a month or when they see a rise in po4
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