Robelle Pool pH Up Sodium Carbonate - 25 lb Bag, Fast-Acting pH Adjustment

Robelle 25-Pounds Premium pH Up is a high-purity sodium carbonate formula designed to raise and stabilize swimming pool pH quickly and predictably.

Maintaining the right pH in your pool keeps water comfortable, protects equipment and surfaces, and helps sanitizers work effectively. Robelle pH Up comes in a concentrated 25-pound bag, formulated to correct low pH (acidic conditions) and bring your pool toward the recommended range. This product is intended for routine correction of pH and is manufactured for ease of use when mixed and applied correctly.

How do I use Robelle pH Up safely and effectively?

Test your pool pH first with a reliable kit. If the reading is 7.2 or lower, follow the dosage chart included with the bag, pre-dissolve the measured amount in a plastic pail of water, then slowly pour the solution around the pool perimeter while the circulation pump runs. Operate the filter system for at least one hour after application, then retest; repeat as needed until the pH reaches 7.4–7.6.

• Always test pH before dosing; treat only when pH is 7.2 or below.
• Pre-dissolve in a plastic pail—do not add water to the chemical in concentrated form.
• Pour slowly around pool perimeter with pump running to ensure distribution.
• Retest after one hour; repeat dosing in small increments if necessary.

What does Robelle pH Up contain and how does it work?

This product is primarily sodium carbonate (soda ash), a widely used alkaline agent for pools. It neutralizes excess acidity in pool water, raising total pH and helping to maintain the recommended 7.4–7.6 range. Because it is a dry, concentrated granular formula, it raises pH rapidly and is suitable for both routine maintenance and larger corrections.

• Active ingredient: sodium carbonate (soda ash) for fast pH increase.
• Dry, granular form dissolves when pre-mixed in a plastic pail.
• Concentrated 25-pound bag ideal for seasonal or large-volume use.
• Helps protect pool surfaces and equipment by reducing acidic conditions.

Will using this product affect alkalinity and pool surfaces?

Raising pH with sodium carbonate can also increase total alkalinity, so check both pH and alkalinity when making adjustments. Proper pH balance reduces the risk of etching or erosion on plaster, concrete and metal fittings, while also improving bather comfort. Adjust gradually and retest to avoid overshooting target ranges.

• Monitor total alkalinity alongside pH to prevent large swings.
• Correcting low pH helps prevent etching or surface damage over time.
• Treat in stages and retest to maintain stable, predictable chemistry.
• If alkalinity rises too much, use a recommended alkalinity reducer per instructions.

Who is this for? Robelle 25-Pounds Premium pH Up is made for residential pool owners, service professionals and property managers who need a reliable, large-format solution to correct low pH. Choose this product if you want a concentrated sodium carbonate formulation to bring your pool pH into the recommended 7.4–7.6 range with straightforward application steps. It’s especially useful for larger pools, frequent corrections, or seasonal startups—just follow the included dosage chart, use proper safety precautions, and always retest after treatment.

• Features:
  • Sodium carbonate for pools
  • Raises pH rapidly
  • Prevents erosion or etching of pool surfaces
  • Adjust and maintain pH at 7.2-7.6

Safety note: wear appropriate personal protective equipment (gloves and eye protection), avoid inhaling dust, and store in a cool, dry place away from incompatible materials. For detailed instructions, refer to the product label and the included dosing chart before every use.