Swimming Pools
Clear blue water isn't necessarily a sign of bacteriologically clean water, but it does offer some assurance that your pool filter is removing most of the suspended solids — algae, lint, hair — that cause cloudy or greenish pools. A pool water filter operating around the clock should ensure clean water. But a sudden influx of swimmers, poor pH balance or an inadequate disinfection level can overload a system.Most pools are maintained close to 7.5 pH units by buffering the water with soda ash if it's too acidic, or mild acid if it's too alkaline. Most backyard pool difficulties are caused by poor maintenance. For instance, throwing soda-ash into the water near the filter can result in calcium deposits blocking the filter.
Changes in the municipal water supply can foil your best efforts to maintain your pool's balance. If the pH or the total alkalinity of your water supply should change, the water you add will disrupt the balance previously achieved. Then the only thing you can do is dump some of the pool water and add fresh, balanced water in its place. You can prevent this from happening by semi-annually checking the pool water's Saturation Index (the measure of pH, calcium hardness, temperature, and total alkalinity giving rise to the desired balance).
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December 4, 2008