Measure the pH of the spa water using test strips or a test kit.
Refer to table on packaging to determine the correct dosage
Add hth Spa™ pH Increaser to the filter skimmer with the spa circulation system running.
Leave running for 30 minutes and recheck pH. Add additional hth Spa™ pH Increaser if required.
Add only to spa or hot tub water. DO NOT mix with other chemicals, including other hth Spa™ products.