The PolyQuat 60 doesn't get broken down very quickly -- it's a pretty stable molecule. High chlorine levels will cleave the polymer into smaller pieces (and hence use up chlorine doing so), but these smaller pieces are still effective. It eventually does break down, but mostly what happens is that it acts as a clarifier and binds to algae and particulate matter and then gets caught in your filter. Also, some gets diluted from splash-out or backwash, just like everything else in the pool. The chlorine does break it apart slowly eventually.
The manufacturer's recommendations for a maintenance dose are generous (and more profitable). You can most likely get away with half their recommended amount -- say, 1 ounce per 10,000 gallons. I believe Carl uses such a relatively small amount in his pool. To be effective, however, you do need the initial dose amount on first addition or at least build up to that amount. Taylor sells an expensive test here that will measure PolyQuat (and linear quats, QAC, as well, but you're not using that).
Richard
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