You said the key word...NORMALLY!
Do a search for my past posts & you will see I fight phosphates every year & they are so high that even FC levels well above shock levels for my CYA levels will not keep the pool from turning green! Let's just say after following everything on here & the old poolforum, I have come to the conclusion that phosphate can & does matter in my pool. This conclusion did not come to me overnight or at the spur of the moment...a couple of years fighting this battle before making this decision.
I have tried phosfree but it only removes small amounts of phosphates...I also use Phosfloc every year but using it, I have to vacuum to waste after letting everything settle, then fill back up with my community water which is extremely high in phosphate due to some metal removers they use in the water system. Two treatments a year usually cures the problem for the time being but the next year it starts up all over again.
I seen the Nature 2 cartridge for phosphate so I thought I would ask about it.
I did a little internet research today & found that SeaKlear offers a phosphate remover that you pour into the pool, let it recirculate, the switch to filter & everything is filtered out rather than having to vacuum to waste.
My poolstore is checking on that for me but he also came up with something else that is supposed to remove 3000 ppb of phosphates from a 20000 gallon pool. He is getting a bottle in tomorrow for me to check out & if I want to try it, he will sell it to me at cost since his store has never sold the stuff.
He also said he has some industrial strength Phos free coming in from Natural Chemistry. He said he normally only sells to pool cleaners, etc. but will sell it to me if I want to try it. He said it is supposed to knock out 3000 ppb also. He said he sells alot every year to our city pools. I am thinking about trying it also.
I know everyone's first instinct here is to say not to worry about the phosphates, but I could use some input if anyone knows anything about any of the above phosphate removers!