Pool Supplies - Pool Equipment and Accessories
Napa Valley, San Francisco North Bay, Ca. USA

Swimming pool sanitation refers to both visual clarity and levels of microflora, such as
 

 bacteria and viruses in swimming pools. The goal of sanitation is to prevent the spread of diseases and pathogens between users. Unsanitized water may also support the growth of algae which will present as a greenish tinge initially, then if left unchecked may completely inhabit the pool water displaying a solid green murky appearance. A rule of thumb is that the water should be sufficiently clear to permit the main drain to be clearly visible from the pool deck at all distances up to ten meters (eleven yards) in a horizontal direction from the projection of the drain on the pool surface. This, however, is merely to be considered a negative indicator, not a guarantee that the pool water is properly sanitized. Swimming pool water can still be contaminated with microscopic organisms, even though it is visually clear. The United States Environmental Protection Agency therefore issued the recreational water standards a few years ago to restrain the bacterial problem. With the similar objective as EPA, the International Organization for Standardization published the standards of ISO 15553 recently.

Only pools and spas that contain filtrated and disinfected water can be considered safe places to swim. Poor pool maintenance may lead to low levels of disinfectants and clogged filters that may place swimmers at risk for diseases and infections. The only way to ensure proper sanitation is to test the swimming pool water with a pool water test kit and fresh reagents.