"Phosphate removal" became very popular with pool stores and services for a while until international relations cause the supply of a key ingredient, a lanthanum compound, I believe, to become unavailable. But it was always nonsense for 99.9% of the people sold it, if not 99.99%! Many people here have phosphate levels that would have pool stores winning Oscars with their dramatic eye-rolling, yet have perfectly clear, safe pools.

It's all about the chlorine!

I hate to say it, but you've obviously not been following the suggested courses of pool maintenance we recommend. Kelemvor has given you good advice that will save you money and I'll add this:
1) test your pool water AT LEAST 2x a day, 3x a day if you can manage and ALWAYS raise your FC back to 25ppm if it's below that.
2) Vacuum your pool to waste every single day until it's clear.
3) Brush your pool every single day to knock algae loose from the walls and floor. Not sure why, but when loose it's more vulnerable to the chlorine.
4) P.O.P.P. needs to be maintained 24/7. That's Pool Owner Patience and Persistence!