Keeping the Pool Clean

As experts in automated chemical treatment for more than 20 years, we are concerned that James Dulley’s May 25 article “Safe Way to Clear Pool Water” may mislead readers into thinking that metal ion systems can be used as substitutes for recognized sanitizers, such as chlorine or bromine.

Dulley’s statement that “many systems are now approved by the National Science Foundation” should read “when used with a minimum chlorine residual of 0.5 ppm [parts per million].”

However, it should be noted that this level of chlorine is sufficient by itself to maintain proper sanitation in residential pools, without the need for expensive, stain-producing metal ion systems. If this level is maintained, there should be none of the unpleasant side effects mentioned by Dulley, such as chlorine odors, stinging eyes or drying skin.

The problem of maintaining a low but effective chlorine or bromine level is now resolved easily with the use of automatic controllers to monitor the activity of the sanitizer. These systems are less expensive, easier to use and more effective than the complicated setup described for metal ion systems.

JACQUES STEININGER

Chemtrol Division

Santa Barbara Control Systems

Santa Barbara