From Yellow Algae to High Cyanuric Acid

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You can raise CYA by getting some granular stabilizer and putting it in a sock or nylon knee high and hang it in front of a return with the pump running until it's dissolved. You can get stabilizer at the pool store or Walmart.
Don't bother testing for it for a week as it won't register fully on a test until then. Just assume it's there and adjust FC accordingly. ?
 
With Stabilizer/conditioner. You can buy it at Lowes, WalMart or.... the pool store. I'd stay away from the latter and check Wally World in the pool section. It's called just that, Stabilizer/Conditioner from HTH. :goodjob:
 
From Recommended Pool Chemicals:

CYA - Cyanuric Acid

CYA can be raised with cyanuric acid. Cyanuric acid is sold under a variety of names, including Stabilizer, Conditioner, Instant Pool Water Conditioner, Stabilizer 100, Stabilizer & Conditioner, etc. Instant Pool Water Conditioner is a liquid product which is significantly more expensive than the other forms.

Solid cyanuric acid should be placed in a sock, and the sock put in the skimmer basket. After adding solid cyanuric acid you should leave the pump running for 24 hours and not backwash/clean the filter for a week. Solid cyanuric acid can take up to a week to fully register on the test, so it is best not to test the CYA level until one week after adding some.
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If you already have some stabilized chlorine products that you want to use up, then you can use those. Dichlor would add CYA quickly. Trichlor would be slow. Just keep in mind that with either of these that both chlorine and CYA are added. Usually people save any Trichlor for when they go on a week-long vacation.
 
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