Read the hot tub owner's manual or consult with the manufacturer to make sure you can use 35 percent food-grade hydrogen peroxide. If there is any natural rubber in the tub, the peroxide will
break it down if it comes into contact with it. Man-made rubber isn't affected.
Drain the water out of the hot tub so you can start fresh. Turn the power off at the breaker box. Then, hook up a garden hose to the drain, or use a submersible pump, depending on how the hot tub is designed. If you're unsure how to drain it, refer to the owner's manual. Refill the hot tub with water
Remove the hot tub filter. Either clean it off per the instructions in the owner's manual or replace it.
Put on rubber gloves and safety goggles. Add 1 cup of 35 percent food-grade hydrogen peroxide for every 500 gallons of water in the tub. Turn the power back on. Turn the circulation pump on and run it intermittently for a day. Don't use the hot tub during this time. Check the filter often and clean it as needed.
Check the level of hydrogen peroxide in the water every week. Use peroxide test strips to determine the concentration of the hydrogen peroxide. Read and follow the strip package instructions. You'll want the concentration level of the peroxide to be between 50 and 100 parts per million (ppm).
Add 1 cup of hydrogen peroxide to the hot tub water whenever the concentration level drops below 50 ppm.
Things You Will Need
- Hot tub owner's manual
- Garden hose
- Rubber gloves
- Safety goggles
- Glass measuring cup
- 35 percent food-grade hydrogen peroxide
- Hot tub filter
- Peroxide test strips
- You can adjust the amount of hydrogen peroxide you use; you may need more than the recommended amount to keep the water clean and sanitary. The exact amount needed depends on several factors, including the water source, how often the hot tub is used, how many people use it, and how much organic material gets into the water. If the amount of organic material is very high, the hydrogen peroxide concentration can be raised to as high as 1,000 ppm.
- To help keep the hot tub water clean, cover it in between uses. Use only chlorinated water, too.