Honestly, I've pretty much ignored my pool over the winter, dumping bleach into now and then. After we refilled our pool last summer the CYA was about 60. I've only used bleach since then. Today I tested it and it was at 100. How does that happen if I'm not using tabs or shock? I'm discouraged now.

And just for reference the other levels I tested were:
FC - 6
TA - 150
pH - 8+