Pool Alkalinity Calculator Australia
Work out how much sodium bicarbonate (bicarb) to add to raise total alkalinity, then confirm with the free dosing calculator.
Fastest path
Enter your pool type, volume, and total alkalinity reading for an exact recommendation.
Open pool chemical calculatorHow much bicarb to raise alkalinity
Use pool-grade sodium bicarbonate or an alkalinity increaser. The chart below is a practical estimate for Australian backyard pools.
| Pool volume | Raise TA by 10 ppm | Raise TA by 20 ppm |
|---|---|---|
| 30,000 L | 510 g | 1.0 kg |
| 50,000 L | 850 g | 1.7 kg |
| 75,000 L | 1.3 kg | 2.6 kg |
| 100,000 L | 1.7 kg | 3.4 kg |
Example: a 50,000 L pool at 70 ppm TA that needs 90 ppm needs about a 20 ppm lift → roughly 1.7 kg bicarb.
Why alkalinity matters
- Low TA makes pH bounce up and down
- Stable TA helps chlorine and copper systems work more predictably
- Fix TA before fine-tuning pH in most cases
Safe dosing steps
- Test total alkalinity and pH.
- Calculate the bicarb dose from the chart or calculator.
- Pre-dissolve bicarb in a bucket of pool water.
- With the pump running, pour around the deep end.
- Retest after 4–6 hours, then adjust pH if needed.
Related dosing tools
Alkalinity increaser products
Recommended bicarb products
Alkalinity increasers available on Amazon Australia.
Spa Buffer Baracuda PRO pH Stabilizer Alkalinity Increaser 1kg
Raises total alkalinity. Pool bicarb. Stabilizes pH levels.
$22.39
Amazon paid link. Confirm current price on Amazon.
Pool Mate Total Alkalinity Increaser 10 lb
100% Sodium Bicarbonate. Prevents pH bounce and equipment damage.
$63.55
Amazon paid link. Confirm current price on Amazon.
Pool Set Alkalinity Buffer 2kg for Swimming Pools
Alkalinity buffer for swimming pools. Stabilizes pH. Prevents corrosion. 2kg size.
$599.92
Amazon paid link. Confirm current price on Amazon.
Sodium Bicarbonate Hydrogen Carbonate for Pool Cleaning
Pure sodium bicarbonate. Raises total alkalinity. Prevents pH fluctuations.
$29.99
Amazon paid link. Confirm current price on Amazon.
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