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    Pool Chemical Winterizing Kits


    • Unlike chlorine-based winter kits that reduce the effectiveness of algaecide and other pool winterizing chemicals and can stain, bleach or damage pool surfaces, In The Swim's chemical kits won’t damage your pool during winter.
    • In The Swim winter kits include a slow-release winter floater filled with a powerful non-chlorine oxidizer.
    • Our unique winter pool floater removes carbon dioxide, one of algae's primary food sources.
    • No staining, no bleaching... just clean, sanitary water. Kills micro-contaminants, algae and pathogens.
    • Includes pool winterizing instructions.
    • Pool water temperature should be at 65 degrees F or below before winterizing.
    • Not for use in winterizing pools using a biguanide based sanitizing system.

    Pre-measured for your specific pool size. Ordering a kit larger than your pool size will help protect from winter cover problems.

    - Small Kit: for pools up to 7,500 gallons
    - Deluxe Kit: for pools up to 15,000 gallons
    - Super Kit: for pools up to 35,000 gallons 

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      • Item: # W1000 Small Pool Closing Kit $19.99

        Pool Winter Chemical Kit, Small - for closing pools up to 7,500 gal.

        1 qt. Pool Winterizing Inhibitor 
        1 qt. Pool Winter Stain-Away 
        1 lbs. Chlorine-free winter pool shock 
        1 Winter Pool Floater - 1.2 lbs. "non-chlorine" winter oxidizer
        1 Winter Sorb™, oil absorbent winter chemical sponge

      • Item: # W1015 Deluxe Pool Closing Kit $32.99

        Pool Winter Chemical Kit, Deluxe - for closing pools up to 15,000 gal.

        1 qt. Pool Winterizing Inhibitor
        1 qt. Pool Winter Stain-Away
        2 lbs. Chlorine-free winter pool shock
        1 Winter Pool Floater - 2.5 lbs. "non-chlorine" winter oxidizer
        1 Winter Sorb™, oil absorbent winter chemical sponge

      • Item: # W1035 Super Pool Closing Kit $45.99

        Pool Winter Chemical Kit, Super - for closing pools up to 35,000 gal.

        1 qt. Pool Winterizing Inhibitor 
        1 qt. Pool Winter Stain-Away 
        3 lbs. Chlorine-free winter pool shock 
        1 Winter Pool Floater - 4 lbs. "non-chlorine" winter oxidizer
        1 Winter Sorb™, oil absorbent winter chemical sponge

      • Product Description
      • Customer Review
      • MORE INFO

      In The Swim Winter Pool Chemicals

      In The Swim sells more winter chemical kits than any other online retailer. Regardless of the size of your pool, we have the pool winterizing kits to meet your needs. Pre-measured for the size of your pool so every pool owner can easily close the pool with the right winter pool chemicals, at the right price. 

      All of our In The Swim Pool Winter Kits Include:

      Chlorine-free Shock

      Our chlorine-free shock is a powerful oxidizing agent, but is non-chlorine, and will never harm your pool surfaces or your pool cover. Chlorine Free winter shock also dissolves faster than chlorine, and maintains greater efficacy at a wider range of pH level. Our premium chlorine-free shock that helps burn off any remaining impurities and won't reduce the effectiveness of other chemicals.

      Time-Release Winter Floater

      Our exclusive time-release winter chemical floater discharges a non-chlorine oxidizing agent into your pool water for months after it's been covered. Not only does this winter pool floater sanitize your pool water, but also works to remove carbon dioxide from the water - eliminating one of algae's primary food sources. Unlike chlorine tablet pool floaters, our non-chlorine winter floater will never stain your plaster or vinyl. 

      Winter Stain Away

      Specifically formulated for closing your pool, Winter Stain Away helps eliminate stain-causing metals and minerals that can leave your pool with costly liner stains or hard-to-clean waterline build-up. Winter stain away sequesters metals – keeping them tied up in solution, to prevent them from precipitating out during winter. Works wonders on mesh safety covered pools, and keeps working all year round to help prevent metal and mineral stains.


      The final step to preventing algae next spring is to pour in our special winter pool algaecide. Dr. Pool's own proprietary polymer blend combines in perfect harmony with the other items in your pool winterizing kit. When used in conjunction with our other pool closing chemicals our Winterizer Algaecide is the perfect "knock-out" punch against algae. Lasts all winter long, even into a warm spring.

      Winter Sorb 

      Made exclusively for In The Swim, the Winter Sorb™ can absorb up to 40 times its weight in residual suntan lotions and body oils to prevent grease, grime and waterline scum. Oils provide a low grade food source for algae, and can clog up the waterways, easily combining with free chlorine to create chloramines. Just toss the Winter Sorb into the pool before covering to absorb floating oils.

      Make the smart choice this autumn, buy your pool winterizing kit from In The Swim, America's #1 Direct Source for winter pool supplies!

      Make sure that the pool water is cleaned, balanced before adding the winterizing kit to the water.  It is recommended to close the pool when the water temperature is less than 65 degrees. 

      Follow the winterizing instructions below.

      Pool Closing

      At the end of the season:

      1. Clean the Pool
      Clean-up next spring will be greatly reduced if the pool is thoroughly cleaned before closing it in the fall. Be sure to vacuum the bottom and skim the surface before proceeding to the next step. 

      2. Balance the Water 
      Balance the components of the pool the same way you would if you were maintaining your pool for the swimming season. All components should be within their desire ranges; add the appropriate corrective chemicals to bring levels into the required range.

      3. Shock the Pool and Add Algaecide
      Lithium Shock or Chlor-Free is recommended for shocking. Pool Shock can also be used, but is not recommended for vinyl liners because of the possibility of bleaching the liner In The Swim Algaecide or Algaecide 50 is recommended for preventative maintenance of algae growth over the winter months. Add the recommended dosage of algaecide and shock treatment while the pool filter is circulating the water.

      4. Add an In The Swim® Non-Chlorine Winterizing Kit
      To make winterizing simple and economical, we suggest one of the Winterizing Kits.  Our kit comes complete with Winterizing Inhibitor, Winterizing Stain-Away, Chlor-Free Shock and a float containing a non-chlorine oxidizer. (Step #3 may be skipped if using a Winterizing Kit)

      5. Lower The Water Level
      Lower the water level in the pool to 4-6 inches below the skimmer. In The Swim® suggests taking all above-ground pool filter equipment indoors for the winter to prevent cracking from freezing water. In-ground pool filters require that the lines be drained, plugged and filled with anti-freeze. Be sure to follow manufacturer’s guidelines and instructions for protecting your underground pool lines. 

      6. Drain and Plug the Lines 
      (For In-Ground Pools Only!) 
      In-ground pools require the lines to be drained, plugged, and filled with anti-freeze. First, the valves must be closed. The next step is to drain or blow out the lines. Plug them with Winterizing Plugs. Proceed to fill the skimmer line withAnti-Freeze. In the spring, the Anti-Freeze can be vacuumed out or drained into the pool since it is a non-toxic formula. Be sure to follow manufacturer guidelines and instructions for protecting in-ground pool lines. 

      Place a Skimmer Guard into the skimmer to prevent costly damage from ice. TheSkimmer Guard acts as an ice compensator, and will prevent your skimmer from cracking once the rain/snow water accumulates in the skimmer. 

      7. Covering the Pool

      Taking the time to correctly cover the pool is the single most important step to opening a clean pool in the spring.

      Winter Pool Chemical Kit Use Instructions:
      • Before Closing the Pool, remove all debris.
      • Kill any algae, brush and vacuum from pool.
      • Adjust pH to 7.2-7.4, and chlorine level to 2-3ppm.
      • Add Winter Pool Stain Preventer; follow label instructions.
      • Add Winter Pool Algaecide; follow label instructions.
      • Add Winterizing Non-Chlorine Shock, according to label.
      • Lower water level in pool to proper level for winterizing.
      • Poke holes in Winter Pool Floater, place in the pool.
      • Place the Winter Sorb in pool, to soak up oils.
      • Cover pool quickly, before debris blows in the pool.
      • Winterize your pool plumbing and equipment.
      What Size Is My Pool (Gallons)?
      In Ground Swimming Pool Gallonage Chart (rectangle pools)

      Average Pool Depth
      Pool Size5 ft.6 ft.7 ft.8 ft.

      Above Ground Swimming Pool Gallonage Chart

      Pool Depth
      Pool Size48 in.52 in.
      12' Round3,5004,000
      15' Round5,5006,000
      18' Round7,6008,300
      21' Round10,00011,000
      24' Round14,00015,000
      27' Round17,00019,000
      28' Round18,50020,000
      30' Round21,00023,000
      12x24 Oval8,0008,500
      15x24 Oval9,30010,000
      15x30 Oval12,00013,000
      16x32 Oval14,00015,000
      18x33 Oval16,00017,000
      21x41 Oval23,00025,000

      If your pool size is not listed above follow the instructions below to determine how many gallons of water your pool holds:

      Average Depth

      It is important to determine the Average Depth because it will be used in one of the equations below to determine the total gallons of your pool.

      Deep End (feet) + Shallow End (feet) ÷ 2 = Average Depth

      Now use one of the easy equations below to find your pool’s gallon capacity.

      Rectangular or Square
      Length (feet) x Width (feet) x Average Depth x 7.5 = Total Gallons

      Diameter (feet) x Diameter (feet) x Average Depth x 5.9 = Total Gallons

      Long Diameter (in feet) x Short Diameter (in feet) x Average Depth x 5.9 = Total Gallons

      Kidney or Free Form
      Long Diameter (in feet) x Short Diameter (in feet) x Average Depth x 5.9 = Total Gallons

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