HTH™ Pool Care pH Up

Pool pH Increaser for Low pH

  •
  • 4 lb.

HTH™ Pool Care pH Up

Pool pH Increaser for Low pH

HTH™ pH Up is a sodium carbonate pool pH increaser that raises low pH back into the ideal 7.2-7.6 range.

  • Prevents corrosive water that damages pool surfaces and pool equipment
  • Target range: 7.2-7.6 (do not exceed 7.8)
  • Safe for vinyl-lined, fiberglass, concrete, and saltwater pools

Product Benefits

Fixes Low pH Fast

Low pool pH makes water acidic. Acidic water corrodes metal equipment, damages pool surfaces, irritates swimmers' eyes and skin, and causes chlorine to burn off faster than it should. Bringing pH back to 7.2-7.6 restores comfortable, balanced water and lets chlorine do its job.

Addresses the Root Cause Too

If pool pH keeps dropping after every adjustment, low total alkalinity is usually the underlying problem. Alkalinity acts as a pH buffer. When alkalinity drops below 80 ppm, pH won't stay stable no matter how much pH Up you add. Test and correct alkalinity first.

Improves Chlorine Efficiency

Chlorine works most effectively when pH is in range. Low pH actually burns chlorine off faster while reducing its sanitizing power. Pools with chronically low pH often have ongoing algae and clarity problems even with adequate chlorine added.

Safe for Every Pool Type

With the pump running, broadcast the recommended dose directly into the pool. Wait 4-6 hours of circulation before retesting. Never exceed pH 7.8 to avoid cloudy water and scale formation. Safe for vinyl-lined, fiberglass, concrete, and saltwater pools. Active ingredient is sodium carbonate.

How to Use

How to Use

  1. Before adjusting pH, test and adjust total alkalinity as needed.
  2. Test pH every week or whenever sanitizer is added using an HTH test kit or test strips.
  3. When the pH is below 7.2, carefully distribute this product while the pool pump is running.
  4. For each 10,000 gallons of water, add one pound if the pH is between 7.2 and 6.8.
  5. Add half as much product if the pH is between 6.8 and 7.2.
  6. Brush the treated area to disperse any undissolved particles and keep water circulating.
  7. After 12–24 hours, retest the pH.
  8. Repeat steps as needed until the desired pH is reached. Do not exceed a pH of 7.8, as cloudy water and scale formation may result.

Dosage Guidelines

Pool Volume (Gallons) Total Alkalinity 50 ppm Total Alkalinity 100 ppm
pH 7.2–6.8 pH 6.4 pH 7.2–6.8 pH 6.4
1,000 0.8 oz 4.8 oz 1.2 oz 14.4 oz
2,500 2 oz 12 oz 3 oz 36 oz
5,000 4 oz 24 oz 6 oz 72 oz
10,000 8 oz 48 oz 12 oz 144 oz
15,000 12 oz 72 oz 18 oz 216 oz
20,000 16 oz 96 oz 24 oz 288 oz
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Ingredients

Ingredients

Sodium Carbonate: 99%

Constituents Ineffective as Adjuvants: 1%

Total: 100%

Not for aquatic environments such as lakes, streams, or ponds.

Safety, Storage, and Disposal

Safety

Warning: Causes moderate to severe eye irritation. May cause skin or respiratory irritation.

Avoid contact with eyes, skin, and clothing. Avoid breathing dust.

Wear goggles and rubber gloves when handling. Wash hands thoroughly after handling.

Remove contaminated clothing and wash before reuse.

Do not mix this product with other chemicals.

First Aid

If in Eyes: Hold eye open and rinse slowly and gently with water for 15–20 minutes. Call a poison control center or doctor for treatment advice.

If on Skin or Clothing: Take off contaminated clothing. Rinse skin immediately with plenty of water for 15–20 minutes. Call a poison control center or doctor for treatment advice.

If Swallowed: Call a poison control center or doctor immediately for treatment advice. Have person sip a glass of water if able to swallow. Do not induce vomiting unless told to do so by a poison control center or doctor. Do not give anything by mouth to an unconscious person.

If Inhaled: Move person to fresh air. If the person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth‑to‑mouth if possible. Call a poison control center or doctor for further treatment advice.

In case of emergency, call 1‑800‑654‑6911. Have the product container or label with you when calling a poison control center or doctor.

Storage and Disposal

Keep product in its tightly closed container when not in use. Store out of reach of children and away from heat or open flame.

Use entire contents, then triple rinse and offer for recycling, or dispose in accordance with state and local regulations.

Do not reuse empty container.

Frequently Asked Questions

  • What does pH Increaser do for my pool?

    HTH™ pH Increaser raises low pH back into the ideal range of 7.2–7.6. Low pH makes pool water acidic, which can corrode metal equipment, damage surfaces, irritate swimmers' eyes and skin, and cause chlorine to burn off faster.

  • What is the ideal pH level for a pool?

    The ideal pool pH range is 7.2–7.6. At this level, chlorine works most efficiently, water is comfortable for swimmers, and pool surfaces and equipment are protected from corrosion.

  • Why is my pool pH too low?

    Pool pH can drop due to heavy rainfall, acidic fill water, high bather load, CO2 dissolved from the air, or the addition of certain chemicals like shock or chlorine products. If alkalinity is also low, pH will be especially difficult to stabilize.

  • How do I use pH Increaser?

    With the pump running, add the recommended amount directly into the pool. Run the pump for 4–6 hours before retesting. Adjust in small increments to avoid overshooting the target range (7.2-7.6).

  • How long does pH increaser take to work?

    HTH™ pH increaser starts dissolving and acting within minutes of being added. You should retest after 4–6 hours of pump circulation to get an accurate reading and determine if a second dose is needed.

  • Can I add pH Increaser and chlorine at the same time?

    No — add one chemical at a time and wait at least 4–6 hours between additions. Adding pH increaser and chlorine simultaneously can cause localized reactions and makes it impossible to accurately assess the effect of each adjustment. Always adjust pH and alkalinity first, allow them to circulate fully, then add sanitizer last.

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Quick Pool Tips

  • Always read product label directions prior to using and use only as directed

  • Always add chemicals to pool water, never the other way around

  • Never add chemicals to pool water when people are in the pool

  • Warning symbol with a triangle and exclamation mark on a blue background

    Never mix products together

  • Always store pool products in a cool, dry location and out of direct sunlight