You either have to use a stabilized form or chlorine such as trichlor tabs or dichlor shock powder. If you use liquid chlorine (bleach) which we recommend for most pools, then you have to add the CYA separately. It is sometimes labeled as stabilizer or conditioner. Check the label ingredients. If it says cyanuric acid or isocyanuric acid, it is the right stuff. Sometimes you can find it other places besides a pool store like maybe Walmart. I usually just get it from the pool store.
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