I've been bringing my CYA down from 150+ this year. Did a half drain and refill. Started at 90. 2 weeks ago around 80. Tested yesterday at 2:00 pm and got 70. But this time it was cloudy, no shadows. Is the test still good? It rained the past two nights before.
Here are my numbers:
CC 0.5 up yesterday
PH 7.8 creeping up, has held @ 7.5 for long time.
TA 100 down from 110
CH 125 steady
Still going by CYA 80 numbers for bleach.
Also: I have not had to backwash for filter pressure in about 3 weeks. I just got the pressure gauge from TFT and it was only reading 13 PSI (previous had 14) now 14 PSI. Is this normal to go so long with out having to backwash. The water is crystal clear and when I turn on the light at night I don't see much of anything floating in the water like in the past. Thank you all for such a great site.