Several comments. Your cya is really high. With a cya over 100, you have a couple of choices. 1 - You can do a partial drain and try and lower it. Or - 2 - you can keep the high cya and just run higher than normal chlorine. Check the post at the following link for more about that. At any rate, you need to quit using the trichlor pucks as they will continue to make your cya climb.

http://www.poolforum.com/pf2/showthread.php?t=365


If you decide to just run higher than normal chlorine readings, you will need to be able to more accurately tell your chlorine reading. I suggest buying Ben's kit at his www.poolsolutions.com website. It is what most of us use and is the best kit you can buy. Or at least, you can dilute your sample and make your test kit read higher. Mix one part pool water with one part distilled water, test as usual and then multiply the result by 2. If you still need to go higher, mix one part pool water and two parts distilled, and then multiply the result by 3, etc.

Calcium hardness is irrelevent for a vinyl pool and even for a concrete/gunite pool, the range is 200-400, not 200-800.

Hope this helps.