I'm a faithful pool forum (all of them) follower and sort of pool obsessed. I use the BBB method for my pool, but my friend has a problem I don't understand. She says the pool store keeps trying to sell her something for the high number of phosphates in her pool. The only thing I've ever heard about phosphates is algae eat them. Her phospate number is >1000. Does she need to buy phosphate remover? She has one of those frogs. Do those put phospates in the water?