I'm a long-time (30-year) pool owner who now, thanks to the TFP forums and Pool School, know that I've done just about everything wrong (LPS, chlorine tablets, $$$ spent on unnecessary chemicals, etc.) but am trying to get smarter and up-to-speed. I'm now doing my own testing and using liquid chlorine with mostly successful results. One problem remains...
I cannot maintain a stable chlorine level over a sustained period of time, with readings sometimes fluctuating wildly between tests. For example, 3 days ago pool looked great and reading were nominal (FC/CC = 1/1 (yes, I know it's low), pH = 7.8, CYA = 50). Then yesterday I discovered multiple greeen algae blooms and FC had dropped to zero! I shocked last night and this morning FC is still at 1, but CC has skyrocketed to 3. Obviously something is consuming the chlorine, but TA is at 100 so I assume stabilizer is OK.
Any ideas?
I cannot maintain a stable chlorine level over a sustained period of time, with readings sometimes fluctuating wildly between tests. For example, 3 days ago pool looked great and reading were nominal (FC/CC = 1/1 (yes, I know it's low), pH = 7.8, CYA = 50). Then yesterday I discovered multiple greeen algae blooms and FC had dropped to zero! I shocked last night and this morning FC is still at 1, but CC has skyrocketed to 3. Obviously something is consuming the chlorine, but TA is at 100 so I assume stabilizer is OK.
Any ideas?