HTH® Ultimate 3" Chlorinating Tablets, 8 lbs

Your pool stays clean and clear with hth sanitizer products, designed to effectively guard against bacteria, algae and other organisms.  We offer two types of chlorine-based sanitizers: stabilized and unstabilized. 


About This Item

HTH® Ultimate 3” Chlorinating tablets keep your pool clean and clear with a 7-in-1 formula that sanitizes pool water, and prevents stain and scale. This formula includes built-in algae protection, clarifier and water softener for the ultimate value in DIY pool care. Apply tablets to feeders, floaters or the skimmer basket, adding 1 tablet for every 10,000 gallons of pool water. Sun protected for longer chlorine life, HTH® 3” tablets dissolve slowly and last up to one week. They’re great for all pool types including vinyl-lined pools and salt water systems.;

  • Kills bacteria
  • Contains built-in algae fighter
  • Built-in clarifier
  • Contains water softener
  • Protects pool surfaces from stain & scale
  • For use in floater, feeder & skimmer
  • Sanitizes up to 1 week
  • 1 tablet treats 10,000 gallons
Stay clean & clear all summer long banner


Sanitize Pool Weekly for Clear and Clean Water

above ground pool with wraparound deck

Kills Algae and Bacteria

Algae can turn pool water green. HTH® Ultimate 3" Chlorinating Tablets destroy algae and bacteria to keep the water looking blue.

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1 Tablet Works for up to 1 Week

These easy-to-use chlorine tablets dissolve slowly and effectively to sanitize your pool. One tablet keeps working for up to one week per 10,000 gallons.

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Formulated to Prevent Chlorine Loss

HTH® Ultimate 3" Chlorinating Tablets are formulated with cyanuric acid (CYA) to help protect against chlorine loss, and they contain built-in algae protection and clarifier.

How to Use HTH® Ultimate 3" Chlorinating Tablets

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1. Test and Balance pH Levels

First, make sure the pH of the water is balanced. If the pH is too high or too low, the chlorine sanitizer won’t work as effectively. The ideal pH range is between 7.2 and 7.8. 

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2. Proper Sanitization Requires Circulation

HTH® Ultimate 3" Chlorinating Tablets release chlorine slowly. Run your pump at least 8 hours per day (or night) to ensure your water is properly sanitized.

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3. Apply to Feeder, Floater or Skimmer

Place one tablet in pool feeder, floater or skimmer per 10,000 gallons of water every week or as often as needed to maintain a chlorine residual of 1-4 ppm. Do not add directly to the pool as this can cause damage to pool surfaces.




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