In The Swim was founded in 1982 by a husband and wife team. Shipping chlorine from the back of their garage and taking orders on their front porch, they began to have a vision that this could be something big. 40 years later, In The Swim remains one of the country's largest online retailers for pool chemicals, supplies and equipment.

Thanks for shopping with us! Visitors can explore our wide range of products, including Chlorine and Shock, Pool Closing, Spa Kits and Covers, Salt Cells, Filter Cartridges, Water Clarifiers, Alternative Sanitizers, Algaecides and Flocculants, Bromine and Water Balancers, Stain Removers and Cleaners, Deck Paint and Patch, Paint and Primer, Hard Wall Pools and Liners, Solar Covers and Reels, and Opening Kits and Chemicals.

Our most popular and versatile pool shock treatment is the In The Swim Calcium Hypochlorite Pool Shock. This product is used to kill algae and bacteria that make pool water cloudy, and can help equip your pool with the ultimate defense system. Daily chlorination of the pool will kill most pathogenic bacteria, viruses, and microbes.

We've got your chemical needs covered with a variety of products, including Cal-Hypo Pool Shock, 3 Inch Chlorine Tablets, Alkalinity Increaser, pH Increaser, pH Reducer, Super Algaecide, Algaecide 60, Super Clarifier, Calcium Hardness +, and Stabilizer / Conditioner. These products are designed to maintain balanced water, control pH and chlorine levels, prevent algae growth, and enhance filter capability.

Our products have received excellent customer reviews, with ratings ranging from 4.5 to 4.7 out of 5 stars. Customers have praised the effectiveness, versatility, and long-lasting defense of our products. We are committed to providing high-quality pool care solutions to ensure your swimming experience is safe and enjoyable.

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