I just had our IG pool refinished.The company warranties stains as long as you keep a 10-12 ppm seqestering agent in the water.They suggested to use jacks magic blue stuff.My question is I understand that these sequestering agents add phosphates to the water.My phosphates are pretty high from the source water(about 1000 ppb).If I keep the agent up to the recommendation Im worring about a algae outbreak with so much phosphate in the water and still adding more.What would you suggest I do?Add the agent and monitor phosphates and then add a phosphate remover.I keep the chlorine about 6 with the cya at 50.I tested for nitrates and have 0 nitrates.Thanks