Sodium Bicarbonate in Pools

This guide explains how and why sodium bicarbonate (baking soda) is used in swimming pools. It’s designed for Flow technicians and homeowners who want to understand this essential water balancing chemical.

Quick Dosage Calculator

Use the calculator below to estimate how much sodium bicarbonate to add based on your pool size and desired alkalinity increase:

Pool Size (gallons):

Desired TA Increase (ppm):

What It Is

• Chemical name: Sodium Bicarbonate (NaHCO₃)
• Also called: Baking soda, alkalinity increaser
• Primary use: Raises Total Alkalinity (TA) in pool water
• Secondary effect: Slightly increases pH

Ideal Alkalinity Ranges

• Standard residential pool: 80–120 ppm
• Plaster startup: 60–80 ppm (builder-specific)
• Saltwater pools: 70–90 ppm

How to Add Sodium Bicarbonate

1. Test the water’s current Total Alkalinity level.
2. Use the calculator above to determine the dose.
3. With pump running, broadcast slowly over the surface (deep end preferred).
4. Allow to circulate for 4–6 hours before retesting.
5. Never add through the skimmer or near returns.

Effects on Pool Chemistry

• Increases Total Alkalinity significantly
• Slight increase in pH
• No effect on calcium hardness
• Raises LSI, reducing corrosion risk

Safety & Handling

• Low hazard level; non-toxic and biodegradable
• May cause mild eye or skin irritation—rinse with water if needed
• Wear gloves and goggles if windy
• Store sealed in a dry area

FAQs

• Can I use baking soda from the store? Yes, but pool-grade is more economical.
• What if I add too much? TA and pH may go too high; reduce with muriatic acid.
• How soon can I swim? Usually within 1–2 hours after full circulation.

Need Help?

Flow technicians follow strict service and startup protocols to keep your water balanced and your surfaces protected. Contact us for expert support.