Those pucks are the reason your CYA is so high. Re-run the CYA test but use some dilution to help figure out what the reading actually is. Take one part pool water and one part distilled water, mix, then use this to do the CYA test. Multiply your test by 2. If you still get a reading of 100, use one part pool water and two parts distilled but multiply the result by 3.

In place of the pucks, you can just use bleach for your source of chlorine. That is what many of us here on the forum do. Take some time to read a lot of the posts on the forum, especially the stickies at the top of many of the sub-forums. Also, go on over to our sister website www.poolsolutions.com and do some reading there.