Is that algae on my walls?

MiggyV

Well-known member
Apr 9, 2020
59
San Diego, Ca
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
Hi TFP Family. I recently moved to a new house and inherited a chlorine pool. Pebble finish is only 2 years old. WhisperFlow pump (looks old) and a CP-2000 by Compool controller inside the house.

I’ve noticed algae forming on the walls. It brushes off easily, but need some advice on how to prevent it from happening or it causing a bigger issue down the road.

My readings are:
FC - 1.5
CH - 580
PH - 8+
TA - 130
CYA - 35

how much of what chemicals do I need to get my chemistry right?
 

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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,826
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
You need to follow the SLAM Process. You need a FAS-DPD test kit for testing FC.

Lower your pH to 7.2. Your CYA is 40 ppm (round up). SLAM level FC is 16 ppm.
 
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MiggyV

Well-known member
Apr 9, 2020
59
San Diego, Ca
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
I just finished the SLAM process and my water looks crystal clear now.
Current readings are:

FC: 3
TA: 150
PH: 7.2
CH: 780
CYA: 30

As you can see my TA is too high and PH too low.
 

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