I have found a product that neutralizes the phosphates in the water no matter what is their level, i put it once and it last for six months (Bluerayxl.com) it is a pretty weird system using a metal cylinder for ionization. It has saved me a lot on algaecides and phosphate removers, even though i still add some remover here and then just to be safe. i have a little problem with algae but i bump up the chlorine to p 2ppm and it goes away with minimal brushing. The only thing im concerned is that it is silver and copper based and dont want any staining even though they state it has a anti staining agent. Has anybody used this product and had problems with staining??