Hi, thanks for responding. I am using the Taylor K-2006 and we have the Hayward sand filter.

TA too low? I thought TA needed to be somewhere around 120? We're at 260ppm right now.

The FC is now over 25ppm and we're holding there. Need to get more testing reagent. I will use the dilution method and try to find out what the real CYA is.

This site is so utterly useful, in the past 4 days I've learned so much!