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2. Drownproofing - Wikipedia

   en.wikipedia.org/wiki/Drownproofing

   Once they had mastered the Drownproofing technique, students learned to stay afloat with their wrists and ankles bound, swim 50 yards (46 m) underwater, and retrieve diving rings from the bottom of the pool using their teeth. Lanoue published a book called Drownproofing, a New Technique for Water Safety in 1963. [5]

3. Waterproofing - Wikipedia

   en.wikipedia.org/wiki/Waterproofing

   A garment described as waterproof will have a water-repellent coating, with the seams also taped to prevent water ingress there. Better waterproof garments have a membrane lining designed to keep water out but allow trapped moisture to escape ("breathability")—a totally waterproof garment would retain body sweat and become clammy. Waterproof ...

4. Waterproof fabric - Wikipedia

   en.wikipedia.org/wiki/Waterproof_fabric

   Drop of water on 100% polyester textile. Waterproof/breathable fabrics resist liquid water passing through, but allow water vapour to pass through. Their ability to block out rain and snow while allowing vapour from sweat to evaporate leads to their use in rainwear, waterproof outdoor sports clothing, tents, and other applications.

5. Water seal - Wikipedia

   en.wikipedia.org/wiki/Water_seal

   Water seal may refer to: Liquid trap seal in plumbing traps; Underwater seal in pleural drainage apparatuses; Waterproofing This page was last edited on ...

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7. Hydrostatic seal - Wikipedia

   en.wikipedia.org/wiki/Hydrostatic_seal

   The seal face was developed to work under high pressure conditions, however the seal face began to warp and deteriorate during stress tests. Once ammonia ( the liquid used in the first hydrostatic seal ) was added, the two seal faces would make contact with each other and begin the erosion process. Cold water was then tested as the ...

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9. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   Disease prevention should be the top priority for every water quality management program for pool and spa operators. Disinfection is critical to protect against pathogens, and is best managed through routine monitoring and maintenance of chemical feed equipment to ensure optimum chemical levels in accordance with state and local regulations. [12]