Chlorine stabilizer (pool stabilizer or conditioner) is a chemical known as cyanuric acid (CYA), or s-triazintrione. It is essentially 100% strength. All chlorine is decomposed or broken down by the sun's ultraviolent light. The presence or CYA in your pool water will decrease the rate of chlorine loss due to sunlight. Chlorine will combine with cyanuric acid and become much less reactive to sunlight. A pool stabilized at 30 - 50 ppm cyanuric acid will have from 1/2 - 1/3 the chlorine loss of an unstabilized pool. Since its only use is to protect from sunlight, there is no benefit to adding cyanuric acid to indoor pools.
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