Good afternoon, I just joined to see if I could get help with CYA problem. My location N. Texas, pool size approximately 20,000 gallons FW in ground with spa, Jandy equipment. I had this problem few years back and dumped water as recommended. I use Sams club tabs and shock and an algaecide.
Now to the problem: week ago added shock in preparation for kids and grandkids and was reading an 8ppm chlorine, 7.2 ph, 150 TA. While swimming with goggles pool slightly cloudy. After 3-4 days everyone went home, check chlorine level and 0-ppm. I had a sample analyzed at local big name store and following numbers:
FC-2.83, TC-2.83, ph-7.2, TA-61, calcium-436, ***CYa-151, copper-.5, phosphates-364, TDS-3200.
At their recommendation dumped water and refill.
Added 8000 gallons water ran pump full day and retest just few minutes ago with big store.
Fc-.22, TC-.22, ph-7.4, TA-46, Calcium-311, ***CYa-167, copper-.6, phosphates-264, TDS-1500.
I ran my own test and have 0 chlorine, ph7.4, TA-100, CYA over 100.. Taylor K2006 test kit.
Their recommendation, dont worry with CYa now that they have no idea why CYA went up instead of down after dumping that much water, just add 18 lbs baking soda and bring TA up and then use non binding shock.
I am so sorry this was long story, but its a true one. I like taking care of my own stuff but apparently I need better help than what I have been receiving. Any suggestions are welcome