To raise pool pH, add sodium carbonate (soda ash) for quick increases or sodium bicarbonate (baking soda) for gradual increases. Test first, calculate dosage based on pool size, and add chemicals slowly with circulation running.
Yes, you can use pool pH increaser in your spa since both use sodium carbonate (soda ash) as the active ingredient. However, you'll need to adjust dosing for your spa's smaller volume and retest after 30 minutes.
Pool alkalinity typically rises due to fresh fill water with high alkalinity, adding pH increasers or certain sanitizers, excessive aeration from water features, and natural processes like algae growth.
