Cloudy water

[Ark2015]

I’m struggling this season to get water cleared up. Hopefully, someone can look at my test numbers and see my problem and make recommendations. Free chlorine has been running high but has been gradually coming down. Today, I vacuumed thoroughly and tested levels. Numbers are: Free Chlorine-6.5, CC-looks like .5, PH-7.2, Cya-100, Alkalinity-70, Calcium Hardness-40.


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[Denniswiseman]

With a CYA of 100 you should target a FC of 11-13
You need to dump half and refill to get to 50 and then use unstabilised chlorine
Excessive CYA renders your chlorine ineffective and you have to use more to get the same sanitation
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
Use these common products to balance your pool
Liquid chlorine (sodium hypochlorite or plain bleach)
Muriatic acid (hydrochloric acid) to lower pH and TA
Bicarbonate of soda to raise TA
Aeration will raise pH only
Soda ash will raise pH and TA
Chlorine / CYA Chart and
Recommended Pool Levels

[Ark2015]

Thank you! I’ll drain half the water and refill. Is the water cloudy because of the high CYA?

[Denniswiseman]

You probably had an algae bloom and the high CYA didn't let your FC do it's job properly
When you get it down to about 50 use liquid chlorine (sodium hypochlorite or plain bleach). The only thing that puts in your water is salt
Also read Slam (Shock Level and Maintain)