During the summer months, when the hot water of a spa is not as desirable, you can use the tub as a pool instead. Since both pools and hot tubs use similar sanitizing chemicals, keeping the water cool is all that is required for the hot tub to function as a pool. There are a few obstacles to overcome, because a hot tub's inclination is to heat the water, but a few tricks ensure the water stays cool enough to enjoy during warmer weather.
Turn the hot tub thermostat's temperature to below 85 degrees Fahrenheit, or turn the heater off.
Remove the cover and turn on the air jets to circulate the water, which helps reduce the water temperature.
Keep the cover on the hot tub when it's not in use. Keeping the hot tub covered insulates it and prevents sunlight from warming the water.
Run the spa at night with the heater and cover off as often as possible to cool the water.
Measure the width and length of the hot tub with the tape measure.
Spread the old pool cover on the ground and transfer the measurements to the cover. Cut the cover to the dimensions of your hot tub with the scissors.
Place the pool cover so that it is centered over the hot tub. Trace around the inside edge of the hot tub with the felt tip marker.
Take the cover off and then cut around the line you made in step 3 with the scissors. This will trim the pool cover to the inside shape of your hot tub.
Place the pool cover back on the hot tub to see how much more you will need to trim off so that it will float on the water.
Cut a small amount from the outer edge of the cover and then test the fit again. Repeat this step until the cover fits inside the hot tub and floats on the water.
Buy H2O2 hot tub cleaner or sanitizer from a pool and spa store. It may also be advertised as hydrogen peroxide cleaner.
Measure 1/4 to 1/2 cup of H2O2 cleaner into a cup for every 100 gallons of water your hot tub holds. Pour directly into the water for regular sanitizing.
Apply a maintenance dose of cleaner up to 10 minutes before getting into the tub. Pour in 1/8 cup of H2O2 cleaner per 100 gallons to ensure the hot tub doesn't become bacteria-laden while people are inside.
Perform regular sanitizing once a week if the water is not drained during that period. Perform maintenance immediately after getting out if the heater will be kept on while the tub is empty.
Clean your vinyl hot tub cover twice a month with soap and water.
Wipe off the chemical residue on the underside of your hot tub cover. The chemicals from the water can damage the cover over time.
Prolong the life of your vinyl cover by making sure the water chemistry in your spa is balanced. Chemical vapors rise up to the cover and cause damage if the vapors are too corrosive.
Clean any mildew with soapy water that builds up around the zipper. This area only needs to be checked twice a year.
Use a good chemical-free hot tub cleaner twice a month to remove any mold, mildew, waterline rings and leaf stains (see Resources below).