I've been reading through alot of the posts about CYA and it seems that the pool stores are recommending shocking and using their chlorine pucks and in the long run all it does is raise the CYA resulting in a harder time maintaining chlorine levels. I just restarted my pool and following PB suggestions (I've shocked twice, but I have NOT kept a puck in the skimmer at all times like they told me to) my CYA is already at 60 and before (1st go around with PB and doing what they told me) my CYA ended up at 150+. Is this a way to keep you coming in for more chemicals or do they not realize what they are telling you to do?? :?: