OK so your saying unless I went crazy last year raising the CYA levels those pucks didn't cause a chlorine lock. I did read through the SLAM article several times but considering I was too cheap to order a kit over my 1004 I am guessing I couldn't get enough info (especially on CYA). I made sure the PH was close or a little lower than the target window and just kept dumping shock in day after day this year. USUALLY that works, I have never had so much trouble before. Even the year of the tadpoles. In fact I have gotten away with only 5-6lbs of shock in the past. If my CYA is in acceptable levels any other ideas on what could be wrong? I assume at this point I might need to just drain, clean up the bottom and start new. Sigh.
I appreciate the help!