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There is one company that makes a 3" puck with no CYA that goes into your skimmer basket. Every bucket of 3" tabs comes with a dispenser that holds two pucks, just drop the dispenser in your skimmer basket. I used them before converting to a SWG last year. They are sold under the name of...

There is another Cal-Hypo 3-inch puck available under the Sustain name. I travel frequently and use this product for my daily chlorine use. I do use bleach to shock but find this puck helps me maintain my chlorine level while I'm away. The puck is not wrapped in plastic and does not erode in a...