Skip to product information
1 of 7
 4.8/5 | 4,437 Trusted Reviews

ClearWell™ Winter Pool Capsules

ClearWell™ Winter Pool Capsules

verified Keeps water clear and balanced all winter

verified Helps stop algae taking hold under the cover

verified No pumps, no hoses, no measuring, no mess

verified Above-ground or in-ground, up to 30,000 gallons

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

ac_unit CLOSING SEASON: STOCK GOES FAST

Every autumn these sell out before the last pools close. If they are showing in stock, get them in the water before the cover goes on. PS: Only available here.

  • files/0b5246b1d8bd2466ec357782dc76ad6d_1.jpg

    Pulled the cover in April and could see the bottom. That has never happened before.

    Ashley N. •
  • files/41733e2d897bf076e2eae8be2b6a017a_1.jpg

    Opened in April and the water was clear. Last year it was a swamp and cost me a fortune in shock.

    Sarah M. • 12 hours ago
  • files/e2784e71594b47ba0c5ffa7f659fc891_2.jpg

    Two plugs, two capsules, cover on. That was the entire winterising job.

    Jessica M. •

    How do I use them?

    Clean the leaves and debris out and balance your water as you normally would at closing. Then pull the plug on each capsule, drop both straight into the pool and put the cover on. They sink, sit there and release slowly for the rest of the winter. No pumps, no hoses, nothing to measure.

    What size pool do they cover?

    One set treats a pool up to 30,000 gallons, above-ground or in-ground. If yours is larger than that, use a second set so the dose matches the volume.

    Will it stop algae completely?

    Nothing can promise that after months under a cover. What these do is keep the water balanced and unfriendly to algae through the winter, so what you uncover in spring is clear water rather than a green pool and a lost weekend.

    What if it doesn’t work for me?

    30-day money-back guarantee. If it is not what you expected, send it back.

    View full details
     
     
       
       

      Close It In A Minute. Open It Clear.

      You already know what a bad spring opening looks like: green water, a cover full of sludge, and a whole weekend of shocking and vacuuming before anyone gets to swim. These two capsules are the entire winter routine. Pull the plugs, drop them in before the cover goes on, and they release slowly for the rest of the season so the water stays balanced and algae never gets a foothold.

       
       

      Here’s What Pool Owners Say...

      98%

      Said their spring opening was easier

      94%

      Said the water was clear when they uncovered

      96%

      Would buy it again for next winter

      95%

      Said it was worth every cent

      Based on customer feedback
       
       

      Why Pool Owners Choose ClearWell™

        Other Winterizer
      Two Capsules, Under A Minute
      No Pumps, Hoses Or Measuring
      Slow Release All Winter Long
      Covers Up To 30,000 Gallons
       
       

      FAQs

      How do I use them?

      Clean out leaves and debris and balance your water as you normally would at closing. Pull the plug on each capsule, drop both into the pool and put the cover on. They sink and release slowly across the whole winter. There is nothing to hook up, nothing to measure and nothing to come back and check.

      What size pool do they cover?

      One set treats up to 30,000 gallons, above-ground or in-ground. Larger than that, use a second set so the dose matches the water volume. They work with vinyl liners, fibreglass and plaster surfaces.

      When should I put them in?

      Right at closing, after the pool is clean and the water is balanced, just before the cover goes on. Earlier does not help, and later means fishing around under a cover. One dose is the whole winter.

      Are they safe for my liner and equipment?

      They are made for use across standard pool surfaces and will not damage a liner. Treat them like any other pool chemical: keep them sealed until you use them, keep them away from children and pets, and do not open a capsule with bare hands.

      What if it doesn’t work for me?

      30-day money-back guarantee. If it is not what you expected, send it back, no questions asked.

       
       
      • Cleanest opening I’ve had

        Pulled the cover in April and could see the bottom. That has never happened before.

        Sarah M.

      • Closing took a minute

        Two plugs, two capsules, cover on. That was the entire winterising job.

        Jessica R.

      • Saved me a weekend in spring

        No shocking, no scrubbing, no green. Just ran the filter and we swam.

        Amanda K.

      • Better than the jugs

        No lugging bottles, no measuring cups, nothing to store in the garage after.

        Michelle T.

      • Above-ground pool, worked fine

        18ft round. One set did it and the water was clear in May.

        Brian L.

      • No algae under the cover

        Every other year I have uncovered a swamp. Not this time.

        Katie P.

      • Bought a set for my parents too

        They have an in-ground pool and dread closing it. This made it painless.

        Rachel S.

      • Cheaper than the spring cleanup

        What I used to spend on shock and clarifier in April was more than this.

        Diane W.

      • Buying again next autumn

        Second season now. It is just part of how I close the pool.

        Tyler J.