Test results-please recommend

[mjt123]

Here are my numbers after replacing about 30% of the water. I have a gunnite bottom and fiberglass walls that have been coated with epoxy paint. Approx. 24000 gallons, sand filter.

Free chlorine: 4
Combined chlorine: <.5
PH: 7.4
alkalinity: 100
CYA: 35 (was 80)
hardness: 90
temp: 75

I believe I need to bring up my alkality and hardness. If so, what should my goal be and is there a non-pool store product that I can do this with?
Please make any recommendations you see fit.

Thank you so much,
Mike

 

[JasonLion]

Those numbers look good to me!

Your alkalinity (TA) is fine where it is. And there is no reason to bring the CH level up (unless you have a spa you forgot to mention).

Remember to keep FC around 3 to 7 and never below 3.

 

[The Mermaid Queen]

And there is no reason to bring the CH level up (unless you have a spa you forgot to mention).

Gunnite bottom needs Calcium??

 

[JasonLion]

Gunnite bottom needs Calcium??

The epoxy paint should have sealed the gunite, so there isn't any exposed plaster or concrete, so no need to add calcium.

 

[The Mermaid Queen]

Sorry, maybe I misread... thought only the walls had been coated... Just trying to earn my keep 'round here!

 

[Guest]

I get the same impression as TMQ, that the bottom is gunite and the walls painted fiberglass.

 

[JasonLion]

mjt123, if the gunite is not painted you need calcium. With exposed gunite calcium hardness should be between 200 and 300.