Phosphate Chemical Treatments for Pools

High Phosphates

• Pool owners are not required to maintain and test for phosphate levels in swimming pools as part of regular maintenance. This is because under normal circumstances phosphates do not harm properly balanced water chemistry. A pool that is consistently sanitized is less prone to spikes in phosphate levels. Ignoring high phosphate levels can lead to development of algae, but it's difficult to tell if the phosphates are the primary reason for the algae growth.

Test

• High phosphate levels in swimming pools are just one reason for algae growth. An improperly sanitized pool is the main contributor. If your pool is regularly sanitized and algae seems to be appearing for no other apparent reason, then you should test for phosphates because this may be a contributing reason. A phosphate testing kit is available at most pool supply retailers. A normal set of pool test strips or a standard testing kit cannot measure phosphates.

Treatment

• Low phosphate levels are not troublesome to your pool, which is important to know because other aspects of pool maintenance are more about balance. In terms of phosphates, only a high number is concerning. Pool retailers sell a chemical that lowers phosphate levels in your pool. The amount of this chemical you add will depend on water capacity and current phosphate level as indicated by the test. Consult the product's guidelines and run the filter for 24 hours after adding the chemical. Retest again after 36 hours.

Prevention

• The first line of defense in preventing the onset of high phosphate levels is to maintain your pool properly. Since high phosphates can be a result of leaves and twigs, skim your pool regularly and vacuum. Empty out the skimmer basket weekly and pool pump basket after you vacuum. Maintain a routine regime of chlorine and test your water weekly. Proper water chemistry involves balancing total alkalinity, pH, calcium hardness and chlorine stabilizers as well.