# How to Remove Calcium From Hot Tub Walls by Lowering the pH
Things You'll Need
- pH test strips
- pH-lowering product
- pH-increasing product
- Cleaning product
Instructions
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1
Turn off the spa before testing or treating the water.
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Use a pH test strip to determine the pH in your hot tub. If your pH is higher than 7.8, you need to lower it.
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Add the pH-lowering product recommended by the manufacturer of the hot tub. How much of the product you need to add depends on the volume of water and how far off the pH level is. Follow your manufacturer's guidelines.
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4
Test the water again to check the pH level. If you've lowered the pH too much, add the pH-increasing product that the manufacturer recommends.
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5
Drain the hot tub every 60 to 90 days. Clean the hot tub's walls with the cleaning product recommended by the manufacturer to remove any lingering calcium scaling. Maintain the proper pH level after you refill the hot tub to avoid future calcium buildup.
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