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Six Steps to Starting Up Your Master Spa

woman relaxing in tan colored hot tub

Starting up your Master Spa is easier than you may think. To simplify the process for you, we have six steps that are easy and quick to keep your hot tub clean and running properly! Take a look at our 6 steps below, and be sure to download and print the Master Spa Quick Guide to Hot Tub Care and Maintenance so you have it any time you need!

Download Master Spa Quick Guide to Hot Tub Care & Maintenance

How To Fill a Hot Tub

    1. Fill your spa with hard water. You never want to use more than 50% softened water when filling your spa.
    2. Add a sequestering agent. During your initial fill, add a sequestering agent (e.g. SpaBoss Prevent II) to control suspended minerals in the water. Allow the water to circulate and filter until the water temperature reaches 80 degrees before adding any other chemicals.

Test your hardness levels. Test your water for hardness with the test strips provided in your start up kit. Your calcium hardness levels should be maintained between 250-500 PPM (parts per million).

  1. Test for alkalinity. Test your water for alkalinity using the test strips provided in your start-up kit. The total alkalinity should be 80-120 PPM.
  2. Test your pH levels. Test your water for pH using the test strips provided in your start-up kit. The pH should be 7.2-7.8 PPM.
  3. Add SpaBoss Chlor-Aid to begin sanitizing the water. Lastly, add 2 tbsp. of concentrated SpaBoss Chlor-Aid per 500 gallons.


  • Tip: You may want to use a pre-filter when filling your spa. It’ll make adjusting the water balance easier after a new fill!
  • Tip: Use SpaBoss Cal-Rise to increase the hardness level, dissolve chemicals in a bucket before adding to spa water.
  • Tip: If pH is low, add SpaBoss pH Plus. If your pH is high, add the SpaBoss pH Minus . Keep in mind that SpaBoss pH Minus also lowers alkalinity, so you will want to re-check alkalinity levels after you use it.
  • Tip: If your alkalinity is higher than 120 PPM, use SpaBoss pH Minus to lower the level. If your alkalinity levels are low, use SpaBoss Alka-Rise.
  • Tip: Do not add the SpaBoss Chlor-Aid until the alkalinity and the pH levels have been properly adjusted. Do not enter the spa when chlorine levels are above 5 PPM.