South Florida pool owner here. My pool gets full sun, and the last week or two my chlorine levels have plummeted quickly after I add liquid chlorine. Guessing I have an algae issue, so I'm SLAMMING right now.
I started yesterday afternoon - CYA starting level was 35 and pH was 7.4. Got the pool up to shock level, brushed and maintained. I only lost 1.5 ppm of Chlorine overnight.
At 7 am the FC was 18.5. But at noon the FC was 12. Is this decline normal with an algae problem? Seems really fast to me.