Why Chlorine Disappears Faster in Summer

During a Las Vegas summer, pool owners often find themselves adding massive amounts of chlorine, only to test the water a day later and find the levels have plummeted to zero. This rapid depletion is primarily caused by the intense ultraviolet (UV) radiation from the sun.

The UV Effect on Chlorine

Free chlorine is highly unstable when exposed to direct sunlight. In fact, on a clear, sunny day with a high UV index, the sun can destroy up to 90% of unstabilized chlorine in a pool within just two hours. The UV rays break the chemical bonds of the hypochlorite ions, rendering them useless for sanitization.

The Role of Cyanuric Acid (CYA)

To combat this, pool professionals use Cyanuric Acid (CYA), commonly known as chlorine stabilizer or conditioner. CYA acts as a molecular sunscreen for your chlorine. It binds to the chlorine molecules, protecting them from UV degradation while still allowing them to sanitize the water.

The Danger of Too Much Stabilizer

While CYA is essential, it is a double-edged sword. Unlike chlorine, CYA does not evaporate or break down over time; it remains in the water. If you exclusively use stabilized chlorine tablets (pucks), your CYA levels will continuously rise. Once CYA exceeds 100 ppm, it causes "chlorine lock," where the chlorine is so heavily protected that it can no longer effectively kill bacteria or algae.

Professional Management

Managing the delicate balance between free chlorine and cyanuric acid is critical in the desert. At 9th Island Pool & Spa Services LLC, we utilize liquid chlorine and carefully monitor CYA levels to ensure your pool remains sanitary without falling victim to chlorine lock or rapid UV degradation.