Pool Alkalinity Levels Chart
Quick Answer
Ideal total alkalinity (TA) for most pools is 80–120 ppm. TA acts as a pH buffer — low TA causes rapid pH swings, while high TA causes pH to drift upward and resist downward correction. Always adjust TA before making pH adjustments.
- Total alkalinity 80–120 ppm is the standard target for most pool types
- Low TA (below 60 ppm) causes pH to bounce erratically
- High TA (above 150 ppm) causes pH to drift up and resist acid corrections
- Always fix TA before adjusting pH for more stable, lasting results
Calculate Your Levels
Reference table
| TA level | Status | Effect | Action |
|---|---|---|---|
| < 60 ppm | Too low | pH swings; corrosion risk | Add sodium bicarbonate (baking soda) |
| 60–80 ppm | Low | Some pH instability | Add bicarb; retest after 24 h |
| 80–120 ppm | Ideal | pH stable and buffered | None — maintain range |
| 120–150 ppm | Elevated | pH drifts upward | Add muriatic acid in small doses |
| 150–200 ppm | High | pH very resistant to correction; scale risk | Lower with acid; aerate to restore pH |
| > 200 ppm | Very high | Severe pH drift; cloudy water; scale | Partial drain + refill + rebalance |
Frequently Asked Questions
What is total alkalinity in a pool?
Total alkalinity measures the concentration of alkaline substances (mainly bicarbonates and carbonates) dissolved in pool water. These substances neutralize acid, preventing wild pH swings. It is measured in ppm (parts per million) with a test kit.
How do I raise pool alkalinity?
Add sodium bicarbonate (baking soda). Use 1.5 lb per 10,000 gallons to raise TA by approximately 10 ppm. Broadcast it across the pool with the pump running, and retest after 24 hours.
How do I lower pool alkalinity?
Add muriatic acid (pH reducer) directly in front of a return jet with the pump running. After adding, run jets or aerate with the cover off to allow CO2 to escape and let pH recover naturally. Repeat as needed over several days.
Does alkalinity affect chlorine?
Yes indirectly. High alkalinity keeps pH elevated, which reduces chlorine effectiveness. Low alkalinity allows pH to drop, which is corrosive and also affects sanitizer balance. Correct TA first, then pH, then chlorine for best results.
Calculate your dose
Also see: Pool Chemical Levels Chart · pH Levels Chart
Last updated: June 2026