How To Lower Alkalinity In Hot Tub With Muriatic Acid. With so many detrimental effects from low alkalinity, you can appreciate how important it is to restore it to its proper level. You need to use an accurate water test kit that can give you correct readings.
In order to lower both the ph and alkalinity of your hot tub water, you will need to add acid. Make sure to fill the bucket with water, before adding the acid to avoid a nasty surprise in the form of a chemical reaction. Assume our pool can hold 20k gallons of water.
Allow the muriatic acid to bubble and then soak the cartridge using muriatic acid and water, 1 part muriatic acid and 10 parts water.
And if you inhale the vapor of the muriatic acid, it could negatively affect your respiratory health. To lower ph and total alkalinity, use a strong acid such as muriatic acid, sulfuric acid, or sodium bisulfate, all of which lower both ph and ta, but at different rates. Leave it for 20 minutes and turn off the spa. And when you add a dry acid, place it in the middle of the tub such that the water is not circulating.