I really think you should hit it with some bleach and forget the pucks. Your CYA is already almost uncontrollably high, and will only get higher with each puck you use. Your pH is also very low...in fact it's too low for you to drop your alk. The good news, though, is that your alk is fine--I'd leave it alone.
If you insist on using the pucks, you're going to have to drain/refill about 1/2 your water, otherwise by late july you're going to have algae problems that won't clear up because of your CYA levels.
Janet
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