is there such a thing as a 3" puck that does not have CYA in it?
i am looking at going BBB and testing the water, and skimming daily and the pucks seem so easy (except for the CYA issue). if they only made one without it i would feed a lot better about using it. my CYA levels are below 20PPM so i think i am safe to use it for a few more weeks. but after it's gone i would like to stay with the pucks but only if i can get CYA free ones.