Hayward Replacement Filter Elements C5501575 Series Easy Clear - Page 4

ALGAE CONTROL Algae is a form of plant life which can vary in size from a few thousandths of an inch to the size of a small tree. Of the many forms of algae, those most frequently found in swimming pool water are microscopic in size and green in color. Algae readily grows in sunlight and can, under favorable conditions, quickly overgrow a swimming pool turning it completely green in just a few hours. On the other hand, swimming pool water can be kept unfavorable to algae growth by simply maintaining a chlorine level of at least 0.5 ppm in the water at all times. The chlorine level should be checked at least once a day using a suitable test kit. If algae condition develops and the pool water "blooms" green, superchlorination of the pool will be necessary to clear it. Add unstabilized granular chlorine, or liquid chlorine. Follow chemical manufacturer's recommendation for superchlorination. The algae will quickly become inactive and can then be removed by the filter. Live algae, on the other hand, multiplies so fast that the filter cannot keep up with its growth rate. When correctly used, commercial algaecides are effective against algae, though algaecides should be used in conjunction with, and not as a substitute for, regular chlorination or superchlorination. Maintaining a chlorine level of at least 0.5 ppm in the pool water at all times is the most effective way to prevent algae growth in swimming pools. POOL CHEMISTRY GUIDELINES SUGGESTED POOL CHEMISTRY LEVELS pH 7.2 to 7.6 TOTAL ALKALINITY 100 to 130 ppm CHLORINE (UNSTABILIZED) 0.3 to 1.0 ppm CHLORINE (STABILIZED) 1.0 to 3.0 ppm CHLORINE STABILIZER (Cynauric Acid) 40 to 70 ppm ACTION REQUIRED TO CORRECT POOL CHEMISTRY TO RAISE TO LOWER Add Soda Ash Add Muriatic Acid or Sodium Bisulphate Add Sodium Bicarbonate Add Muriatic Acid Add Chlorine Chemical No action - chlorine will naturally dissipate Add Chlorine Chemical No action - chlorine will naturally dissipate Add Stabilizer Dilution-partially drain & refill with pool water that has not been treated with Cyanuric Acid © 1998 Hayward Printed in U.S.A.