How to decrease alkalinity in spa. The acid when combined with water decreases total alkalinity and maintains ph level. The easiest way to lower alkalinity is to add sodium bisulfate to the water. Test the hot tub water with the test strip for total alkalinity.
If the alkalinity is not lowered repeat the process. To lower alkalinity more than ph add the ph decreaser with the spa pump off to lower ph more than alkalinity add the ph decreaser with the spa pump on to raise alkalinity more than ph use alkalinity increaser with the spa pump off to raise ph more than alkalinity use ph increaser with the spa. The first thing you need to do is calculate how much sodium bisulfate you need to add according to the volume of water in your tub as well as how much you need to lower the ta.
Test the water again. How to lower the alkalinity levels in a hot tub step 1. Leave it for 20 minutes and turn off the spa.
The strip is placed in the water and pulled out. If you need to lower the total alkalinity in a hot tub with 1000 gallons.