Robelle Alkalinity Up for Pools 20 lb — Sodium Bicarbonate, Fast-Dissolving for Stable pH & Low Cloudiness

Robelle 20-Pounds Premium Alkalinity Up is a fast-dissolving sodium bicarbonate formula designed to raise and stabilize total alkalinity in swimming pools.

Keeping total alkalinity within the proper range prevents rapid pH swings and helps your sanitizer work more predictably. Robelle Alkalinity Up is concentrated for pool use, easy to apply while the pump runs, and dissolves quickly to minimize cloudiness. Use a reliable test kit to confirm current alkalinity and follow the product dosing guidance for safe, effective adjustment based on pool volume and surface type.

How much alkalinity does this product add to my pool?

Robelle Alkalinity Up uses sodium bicarbonate to increase total alkalinity predictably. According to the formulation, 11 ounces will raise alkalinity approximately 10 ppm in a 5,000 gallon pool, so you can scale doses by pool volume to reach target ranges.

• 11 oz ≈ +10 ppm per 5,000 gallons
• Measure pool gallons first for accurate dosing
• Add product with pump running for even distribution

What are the ideal alkalinity ranges for different pool surfaces?

Different pool finishes need different alkalinity levels to protect surfaces and equipment. Keep fiberglass pools a bit lower and vinyl-lined pools at the higher end; plaster, tile, and painted finishes sit in the middle to avoid etching, scale, or liner stress.

• Fiberglass pools: aim for 70–100 ppm
• Plaster, tile, painted, exposed aggregate: 80–120 ppm
• Vinyl-lined pools: 120–140 ppm

How do I apply Robelle Alkalinity Up safely and effectively?

Test total alkalinity first, then calculate the dose based on pool volume and desired ppm increase. Broadcast the granules around the deep end or pour dissolved solution into the deep area while the pump is circulating; avoid adding product directly to skimmer openings or near return jets alone.

• Run the circulation pump during and after application
• For large adjustments, add in stages and retest after circulation
• Store product in a cool, dry place away from moisture

Will raising alkalinity affect my pool’s pH and equipment?

Raising total alkalinity stabilizes pH, reducing pH bounce and enabling sanitizers to remain effective. Proper alkalinity also reduces the risk of scale forming on surfaces and minimizes corrosive conditions that can damage metal fittings and equipment.

• Supports pH stability for easier maintenance
• Helps prevent scaling and metal corrosion
• Reduces risk of surface etching with balanced chemistry

Who is this product for: Robelle 20-Pounds Premium Alkalinity Up is intended for pool owners and maintenance professionals who need a reliable, easy-to-use alkalinity increaser. It’s suitable for all common pool surfaces—fiberglass, vinyl, plaster, tile, painted finishes—and for pools of varying sizes, provided proper dosing is followed. Use it when tests show alkalinity is below recommended ranges, and incorporate regular testing into your routine to keep water chemistry balanced and equipment protected.