Pool Opening & Closing

Refresh your pool for the start of the season in as little as three days!

Day 1 [New Pools]

  • Take a water sample to your local GLB® or HTH® EXTRA professional dealer to be tested. Testing the water you are adding will allow you to identify what minerals and chemical factors may require attention later. Ensure that your stabilizer level is also checked. The ideal range should be between 30 and 50 ppm.
  • Check that your pool filter is clean. If it is not, use GLB® Filter Cleanse as directed. Soak the filter overnight for best results.
  • Begin filling the pool. After the pool is filled with several centimeters of water, add GLB® Sequa-Sol® Stain Control (120 ml/10,000 L). This will prevent minerals in the water from staining or damaging pool surfaces.
  • As the pool completes filling, add GLB® Clear Blue® Clarifier (30 ml/10,000 L) to clear the water of small particles. Fill the pool to the middle of the skimmer or the proper level recommended by the manufacturer. Once filled, start the pump and filtration equipment. Run the pool filter overnight or 24 hours if possible. While the filter is running, it is an ideal time to vacuum and remove any debris from the pool.

Day 1 [Existing Pools]

  • Confirm all pool equipment (pump, filter, valves, etc) is in operational condition, with baskets, lids and drain plugs in place per equipment manufacturer's recommendations.
  • Check that your pool filter is clean. If it is not, use GLB® Filter Cleanse as directed. Soak the filter overnight for best results.
  • Fill the pool to the middle of the skimmer or the proper level recommended by the manufacturer. Once filled, start the pump and filtration equipment. Run the pool filter overnight or 24 hours if possible. While the filter is running, it is an ideal time to vacuum and remove any debris from the pool.
  • Take a water sample to your local GLB® or HTH® EXTRA professional dealer to be tested. Testing the water you are adding will allow you to identify what minerals and chemical factors may require attention later. Ensure that your stabilizer level is also checked. The ideal range should be between 30 and 50 ppm.

Day 2 [New & Existing Pools]

  • Test the pH and total alkalinity (TA) levels of the pool water with GLB® or HTH® 4-Way Test Strips. Always adjust the TA level before adjusting the pH. The ideal TA range should be between 80-120 ppm. Next adjust the pH levels to between 7.2 and 7.8 by adding GLB® pH Plus or GLB® pH Minus.
  • Add GLB® Super Shock or HTH® EXTRA Super Shock for Swimming Pools or GLB® Oxy-Brite® Non-Chlorine Shock Oxidizer to destroy any contaminants that have accumulated in the water. Follow directions on package.
  • Begin sanitizing the water by adding one of the following:
    • GLB® Multi-Purpose Chlorinating Pucks
    • GLB® Duration® Chlorinating Tablets
    • GLB® Stabilized Chlorinating Pucks
    • HTH® EXTRA Multi-Purpose Chlorinating Pucks
    • HTH® EXTRA Duration® Chlorinating Tablets
    • HTH® EXTRA Stabilized Chlorinating Pucks
    • HTH® Granular Super 70
  • Follow directions on package. Adjust the sanitizer level into the range of 1-3 ppm and allow the water to circulate overnight.

Day 3

  • If your stabilized level is less than 30 ppm, prevent chlorine loss due to sunlight by adding GLB® Stabilizer & Conditioner. Follow label directions.
  • Prevent algae from developing by adding GLB® Algimycin® 2000 or HTH® EXTRA Algimycin® Algaecide or HTH® EXTRA 60% Algaecide. Follow label directions.

Pool Closing

Ensure an easy spring start-up when you close your pool correctly.

Firstly, prepare the equipment.

  • Brush pool walls and floor.
  • Vacuum any debris from the pool floor.
  • Clean the filter with GLB® Filter Cleanse.
  • Lower the water level if you live in an area where the water freezes during the winter season. Drain all the water from pipes, pumps, heaters, filters and other pool equipment to prevent damage due to freezing temperatures. If you live in a mild climate where the pool if left full and uncovered, refer to the manufacturer's directions to determine if the filtration system should continue to operate.

Secondly, treat the water.

  • Add GLB® Super Shock or HTH® EXTRA Super Shock for Swimming Pools or GLB® Oxy-Brite® Non-Chlorine Shock Oxidizer to destroy organic contaminants. Follow label directions.
  • Add a winterizing dose of GLB® Algimycin® 2000 or HTH® EXTRA Algimycin® algaecide, GLB® Algimycin® Poly 60 or HTH® EXTRA 60% Algaecide to prevent algae growth throughout the season. Follow label directions.
  • Add GLB® Sequa-Sol® Stain Control to protect the pool from stains and scale formation.

If you live in a mild climate where the pool is left full and uncovered with the filtration system still operating, regularly follow your GLB® or HTH® EXTRA preferred 3-step system. Read labels for winter dosing instructions.

Note: For added convenience you can use the GLB® Pool Closing Kit (Treats up to 100,000 L), which comes complete with GLB® Oxy-Brite® non-chlorine shock oxidizer, GLB® Sequa-Sol® Stain Control and GLB® Algimycin® 2000 algaecide. Follow winter dosing directions on the package.