Pool not holding chlorine

[kmwaters03]

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.

 

[HeyEng]

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.

Chlorine / CYA Chart - Trouble Free Pool

We help our users know just how much chlorine they need in their pools. Using this chart you will see ideal chlorine range and your Shock Level for a Slam.

www.troublefreepool.com

.

 

[Mdragger88]

Visible algae- Sounds like you need to SLAM Process.