It is essential to fill your tub with SOFT water. Failure to do so may result in premature failure of your ACE cell. See dealer for instructions if you do not have access to soft water.Prepare (Complete these steps every time you refill your spa) 1. Fill Spa with all soft water. Fill through the filter compartment. 2. Power up the hot tub. 3. Add _____ oz. of Start. (1 oz per 100 gallons) 4. Allow spa to warm up to desired temperature. 5. Remove and rinse filters. 6. Test & adjust water to the following levels Do not skip this step.