At the end of last summer, before I discovered TFP, I bought 2 gallons of HtH AlgaeGuard. After searching the board, I see that it is referred to as a linear quat instead of a poly quat, it isn't terribly effective, and it can cause foaming. My question then: Does anyone have any suggestions on what I should do with it? I doubt it's something I want to throw in to a landfill. We do occasionally have household hazardous waste collections, so I could hang on to it until then, and turn it in.