CYA Level Somehow Increased

[CJDahl]

I forgot to mention my other readings are as follows:

FC 4.8
TC 4.8
PH 7.8
Hard 250
Alk 170
CYA 100

Thanks again!

[chem geek]

Yes, it should have added 36 ppm CYA to your pool. Maybe your pool really already had CYA in it.

[CJDahl]

thanks for response chem_geek.

I had totally drained the pool dry to fix a problem with liner so I'm not sure where the extra CYA could have come from. A real mystery.