Pool Troubleshooting

Possible Cause

Solution

Preventative Maintenance

 Cloudy, Dull Water
Dirty Filter Use GLB® Filter Cleanse or GLB® Filter Fresh® filter cleaner. Backwash as necessary and clean filter thoroughly as needed.

pH Too High Test pH and total alkalinity. Adjust as required. Test frequently and maintain a pH of 7.2-7.8 and a total alkalinity of 80-120 ppm.

Free Chlorine Residual Too Low Test for chlorine residual and adjust as needed. Shock treat with GLB® Oxy-Brite® non-chlorine shock oxidizer or HTH® EXTRA Super Shock. Maintain free chlorine level of 1-3 ppm.

Filter Not Removing Small Particles Use GLB® Clear Blue® clarifier to coagulate small particles. Check filter operation. Use GLB® Clear Blue® clarifier weekly (30 ml/20,000 L).

Backwashing Sand Filters Too Often Backwash less frequently, only as recommended by the filter manufacturer. Use GLB® Filter Cleanse or GLB® Filter Fresh® filter cleaner twice per season to remove grease, oil and scale from the filter and to improve filter performance.

Dissolved Metals in the Water Use GLB® Sequa-Sol® stain control to control metals in the water. Use GLB® Sequa-Sol® stain control weekly (30 ml/20,000 L) to prevent staining and scale formation.
 Cloudy, Green Water
Green Algae Use HTH® EXTRA Super Shock or GLB® Super Shock to control algae. Use GLB® Drop N' Vac® flocculent to help remove dead algae. Use HTH® EXTRA 60% Algaecide (25 ml/10,000 L) or GLB® Algimycin® 2000 algaecide (31-62 ml/10,000 L) weekly to prevent algae growth.
 Black and/or Dark Green Spots
Black Algae Use HTH® EXTRA Super Shock or GLB® Super Shock as directed. Add HTH® EXTRA 60% Algaecide or GLB® Algimycin® 2000 algaecide as directed then bursh pool surfaces daily until algae is gone. Use GLB® Drop N' Vac® flocculent to help remove dead algae. Use GLB® Algimycin® 2000 algaecide (31-62 ml/10,000 L) weekly to prevent algae growth. Adjust returns to provide better circulation over affected areas.
 Yellow Slime/Deposits
Mustard Algae Clean filter with GLB® Filter Cleanse or GLB® Filter Fresh® filter cleaner. Brush affected areas to loosen algae. Use GLB® Algimycin® 2000 algaecide or HTH® EXTRA 60% Algaecide. Use GLB® Drop 'N Vac® flocclent to help remove dead algae.  Use HTH® EXTRA 60% Algaecide (25 ml/10,000 L) or GLB® Algimycin® 2000 algaecide (31-62 ml/10,000 L) weekly to prevent algae growth.
 Reddish, Brown Water
 Iron or Manganese Dissolved in Water Use GLB® Sequa-Sol® stain control to suspend and inactivate stain-causing minerals. Use GLB® Sequa-Sol® stain control weekly (30 ml/10,000 L).
 Clear, Green Water
Dissolved Copper from Fill Water and/or Corrosion of Copper Equipment Use GLB® Sequa-Sol® stain control as directed. Test and adjust pH and total alkalinity. Use GLB® Sequa-Sol® stain control weekly (30 ml/10,000 L).
 Stains and Rust
Metals in Water Use GLB® Stain Magnet to remove stains. Follow treatment with GLB® Sequa-Sol® stain control to prevent staining. Use GLB® Sequa-Sol® stain control weekly (30 ml/10,000 L).

Unbalanced Water Make necessary pH and total alkalinity adjustments. Maintain a pH of 7.2-7.8 and a total alkalinity of 80-120 ppm.
 Calcium and Scale Deposits
pH or Total Alkalinity Too High Test pH and total alkalinity. Adjust as needed. Use GLB® Sequa-Sol® stain control weekly to prevent scale-forming calcium from precipitating out of solution.

Calcium Content Too High Dilute pool water with water of lower hardness. Use GLB® Sequa-Sol® stain control as directed. Use GLB® Sequa-Sol® stain control weekly to prevent scale-forming calcium from precipitating out of solution.
 Skin and Eye Irritation
Combined Chlorine Level Too High Apply GLB® Super Shock or HTH® EXTRA Super Shock. Test for free chlorine residual and adjust to 1-3 ppm. Maintain disinfectant level of 1-3 ppm at all times regardless of pool usage or weather conditions.

pH Too High or Too Low Test pH and total alkalinity. Adjust as needed. Maintain pH of 7.2-7.8 and total alkalinity of 80-120 ppm.
 Chlorine Odor
Combined Chlorine Level Too High  Apply GLB® Super Shock or HTH® EXTRA Super Shock. Test for free chlorine residual and adjust to 1-3 ppm. Test chlorine level daily. Maintain pH of 7.2-7.8, total alkalinity of 80-120 ppm and a free chlorine residual of 1-3 ppm. 
 Scum and Odors
Grease and Oil from Swimmers Use GLB® Natural Clear clarifier cleaner to dissolve oils and lotions. Clean walls and surfaces with GLB® TLC® surface cleaner. Thoroughly clean the filter using GLB® Filter Cleanse or GLB® Filter Fresh® filter cleaner. Shower before entering the pool. Maintain a clean filter with periodic cleaning. Use GLB® Super Shock, HTH® EXTRA Super Shock or GLB® Oxy-Brite® non-chlorine shock after heavy pool use to destroy non-filterable contaminants. Use GLB® Natural Clear clarifier weekly.