I've only been using 3-way strips since the pool was installed, but in the past month FC has been reading zero, even though I've shocked with granular shock a couple of times. No sign of algae. Wondering if CYA may have climbed due to the use of 3" Tri-chlor tabs. Ordered more test strips with CYA (should be here in a day or so).
I'm in a rural area. No competent pool stores nearby. Willing to buy better tester and learn to use, but I'm worried that I can't get a FC reading.
Note that I don't have a SWG. Pool company (Anthony&Sylvan) recommended against it, even though they had been installing for past 10 years. Instead I have an ozonator, Nature2 cartridge, and chlorine tablet feeder.
What steps should I be taking immediately to correct my problem and get a FC reading back.
According to my strips: FC=0, Alk=100, pH=7.2