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Have you tested your pool water lately?

Twice weekly water testing is fast and easy with HTH™ Test to Swim™ app, now with more accurate results.

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  • Solve Chlorine
    lock for good

    Only HTH™ fast-dissolving shock with Cal Hypo clarifies and rids water of contaminants without using any CYA (cyanuric acid). That means it won't overstabilize or cause chlorine lock—ever.

    Shop HTH™ Shock 
  • The most trusted
    name in spa care

    For generations, HTH™ has been leading the way in smart spa care. We do the chemistry so you can just take it easy. Relax with confidence—you're in an HTH spa™.

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