Hi, Kevin,

I saw your new thread you started. It's helpful to stay with the original thread so folks can follow your progress better.

Okay, 0 CYA means you need some . I'd recommend putting in enough to get to 30ppm...5 or 6 lbs should do it. Do not expect it to show up on a test for 4-7 days. Put it in as soon as you can.

That 4 gallons of bleach will "shock" your pool and probably disappear the next day. After that, I'd bring my Cl level up to about 3-5ppm each evening. That level will start to hold as your CYA kicks in. After that, you're good to go. (especially if you "kick out" that cartridge!! )