So glad to have found this site. My husband I just recently bought a house that has a 20K gallon fiberglass pool. We've been pouring chemicals into it with yo-yo results with the pool store directives, so I decided to do some of my own research which got me here.
First, our CYA is off the charts...I mean a few drops in the bottom and you can't see the black dot anymore. So, we drained it about 1/2 way yesterday (read that fiberglass pools should never be drained so didn't want to go too far) and refilled. Tested this morning and it's still way above 100.
Can't figure out FC. It was low after the refill, around 3ppm. I need to shock the pool to get the green algae growing on the sides and the pool calculator tells me to go up to 15, but my pool test kit (Taylor K-2005) only goes up to 5. How am I supposed to know how high it gets?? I added 182 ml of bleach this morning, and now it's above 5 but I don't know how high. I am not using any chlor tabs since our CYA is already way too high. Any suggestions would be much appreciated!
Our TA is still high after the refill, around 140 ppm. Aerating now (thanks to this board I now know how) to get the TA down and the pH up (currently around 7.0)
Great site with great advice!