hth® alkalinity increaser, 5 lbs

hth® alkalinity increaser raises total alkalinity in swimming pool water.


About This Item

The ideal alkalinity range is 60-120 ppm. If the total alkalinity is too low, pH will fluctuate excessively.

  • Raises alkalinity
  • Helps keep pH levels in range
  • Compatible with salt systems
  • Apply direct to pool


Balance With HTH Alkalinity Increaser

Raises pH and Alkalinity of Water

If your pool’s pH level is too low (lower than 7.2), try HTH Premeasured Water Soluble Pods pH Up to raise the pH levels and total alkalinity of the water. 

lady relaxing in pool

Allows Sanitizers to Work More Effectively

Did you know your pool sanitizer works best when pH is between 7.2 and 7.8? Get the most out of your swimming pool sanitizer by balancing the water first.

Improves Comfort of Swimmers

If the pool water has pH that’s too low or too high, eye and skin irritation can occur. Keep everyone comfortable with properly balanced water.

How to Use HTH Alkalinity Increaser

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1. Test pH Levels

Use HTH Multi-Purpose 6-Way Test Strips to test the pH level. The ideal pH range is between 7.2 and 7.8. If the pH is too low, raise it with HTH Premeasured Water Soluble Pods pH Up. 

2. Determine Dosage

Looking at the instruction labels on the back of the pack, determine necessary amount depending on pool volume (gallons) and pH level from step 1.

pool chemical packet line graphic image

3. Apply Directly to Water or Skimmer

With the pump running, add to pool skimmer or directly to the pool water spread evenly around the deep end of the pool. Use a pool brush to disperse any undissolved chemicals.




Day After

boys playing on floats in water