How to Change The Water in Hot Tubs


With normal contamination, natural body acids and oils, or debris that has made its way inside, eventually the water in your hot tub will need to be changed. Before adding fresh water, drain the old water. Do not mix clean, fresh water with the contaminated water already inside of the tub. To cut your refill time in half, use a tarp and drain and fill the hot tub at the same time.

Things You'll Need

  • Sump pump
  • Plastic sheet
  • Hose
  • Tape measure
  • Scissors
  • Measure the height and width of your hot tub.

  • Cut a plastic sheet big enough to fit over the top of your hot tub and cover all sides.

  • Locate your drainage system. It may be a simple valve on the side of the tub or beneath a panel. With some systems, you may have to use a siphon method or a sump pump. Check the manufacturer's instructions for the proper method to drain your hot tub.

  • Drape the sheet over the surface of the hot tub so it overhangs evenly on every side.

  • Place a hose on top of the plastic sheet. Begin draining the hot tub. As the water drains from under the sheet, turn on the water to the hose. Under the weight of the fresh water, the sheet will begin to displace the draining water.

  • Monitor the speed at which the tub is draining. Add or lessen the fresh water flow to compensate. Ideally, new water flow onto the plastic sheet should be equal to the water flow from the drain.

  • Turn off the drain valves or remove the pump when the old hot tub water has completely drained. The new water will be sitting on top of the plastic sheet, which can now be pulled out from the side or punctured and removed.

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  • Photo Credit pool spa 1 image by Aaron Kohr from
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