While the boys talk about making their guns go "bang", I'll answer your question. I went through a ton of Chemi-Clean, and all I accomplished was to deplete my bank account. I finally broke down and bought the BRS dual GFO canisters and a Mag-Drive 3 pump. They sell it with a Cobalt MJ-1200 pump, but I was informed by BRS that the 1200 wasn't strong enough to run high-capacity GFO and carbon. It would work fine for regular GFO, but I opted to use high-capacity since it lasts longer. Since installing the canisters, my PO4 has dropped to .04. I change out the carbon every two weeks, and GFO about every 4-6 weeks. I usually let the algae on the glass be my indicator for changing GFO. When I have to clean the glass a couple more times a week, it's time for a change. I rarely test my PO4 level, but when I do, it's always .04... or less.
PS: Don't take it the wrong way, guys... I've done my share of hunting. There's nothing like the sweet smell of gunpowder early in the morning... lol!!!
