Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Much better than other products I've tried

I have a problem with the water quality here; it's well water that has problems with high phosphate levels. I attribute that to living in a (largely former) agricultural area...phosphate-based fertilizers. The amount of algae varies directly with the phosphate concentration with little-to-no changes in any other ion concentration.Anyway, this is the only non-copper containing stuff that works well and consistently. With the other stuff that I bought, I might as well have had the fish swimming in pure algaecide.In my experience, this manufacturer sells a pretty good product line and I don't know why I didn't start with them.I do have a phosphate sponge in one of the filters and I have live plants, snails and a fair number of monster Discus. Everybody is doing fine after months of treatment.Yes, months. It takes a lot to keep the algae at bay and I try to watch how much I feed the crew.