Pool not holding chlorine


New member
Jun 22, 2020
Hello! I've been pretty good at maintaining my pool chemistry. But the past week or so it doesn't seem to be holding chlorine. Here are my current settings:

TA 90
CYA 30
FC 0
PH 7.8

I just put two jugs of 12.5 liquid chlorine in two days ago and there's no chlorine already. Seems strange to me. Would love some advice. Also see a small bit of algae on the walls but not a lot.


Gold Supporter
Silver Supporter
Nov 7, 2018
Oklahoma City, OK
Did you test for CC's? Your CYA is fairly low, so that will cause your chlorine to be used up pretty darn quick. Here's a quick primer/review on the CYA and FC relationship.