Water Chemistry /
How Much Soda Ash to Raise pH in a Pool?
The right amount of soda ash depends on your pool volume and current pH. Test first, follow the label, circulate the water, and retest before adding more.
Archive date: this article was written for PoolSkimmer on Oct 24, 2026 and given the earlier archive date of Jan 23, 2026 so the blog reads as an organized archive. It was not published on that date.
Raising pH with soda ash: how much is enough?
One cannot put a safe figure on the amount of soda ash for every pool. The right quantity is a matter of your water volume, where the pH stands at present and what the product label dictates. Soda ash (sodium carbonate) will do the job of raising pH in a swimming pool, but because the proper dose can vary, it is an error to guess. The sensible approach is to test the water, follow the manufacturer’s instructions and retest once the water has cycled.
Precautions before you add soda ash
A good rule is to begin with a dependable water test and put down the pH reading. Should your kit give you total alkalinity as well, record that; the two work in tandem when it comes to pool chemistry.
If one is to be working around the skimmer basket or pump strainer, observe the following:
- Shut the pump off.
- Put on the PPE appropriate to the chemical at hand.
- Heed the product label and keep the container sealed.
- Refer to the equipment manual for the proper way to gain access and perform maintenance.
Hayward’s own advice is to test often, apply chemicals as required and see that circulation gear is clean and in order per the maker’s directions.
A safe way to apply soda ash
Do not deviate from the label. Add the soda ash in the way the instructions set out and allow for full circulation before you test again. There is no point in putting more in too soon.
To avoid overcorrecting and creating a fresh imbalance in the water, a practical method is:
1. Confirm the pH with a test. 2. Consult your records or documentation for the pool’s volume. 3. See what the soda ash label recommends. 4. Apply only if the label allows for it. 5. Let the system run until the water is well mixed. 6. Retest to determine if further action is called for.
Dealing with cloudy water
It is not uncommon for soda ash to leave the water looking cloudy, particularly with poor circulation or if it was put in too fast. That does not necessarily mean the product has done its job poorly; the water may simply need time.
When pH correction goes awry it is usually due to one of these factors: adding too much in one go, not waiting for the first dose to circulate, dirty skimmers, or treating cloudiness as if it were solely a pH matter. If the cloudiness persists after you have given the water a good mix, look to filtration or other chemistry for the cause.
Time to call in a professional?
There are times when a qualified pool pro should be brought in. This would be if the pH continues to fall after you have made an adjustment, or if test results are hard to make sense of. Also consider calling if you have a combination of pH trouble and stained or algae-prone water, or if there is any reason to suspect a fault with the pump, filter or electrical system. For safety’s sake, do not swim in unbalanced water or if there are electrical concerns.
The bottom line
The most reliable answer to how much soda ash to use is this: take the smallest amount the label and your test results indicate, then circulate and check again. It is better to measure and correct in stages than to try and judge by eye. And if the same problem crops up time and again, it is likely a matter of maintenance or equipment rather than something a one-off chemical application can resolve.
Sources and further reading
- [Hayward: Weekly pool maintenance](https://www.hayward.com/maintenance/weekly-pool-maintenance)