Use White Vinegar to Clean The Jets
Use white vinegar to clean valves and jets if they get an excessive buildup of calcium.
In high ambient temperature times of year, if your hot tub is creeping up in temperature because of these high temperatures, put 2 tennis balls between the acrylic shell and cover at night to allow the cooler night temperature to help keep the water temperature down.
Keep your cover open for 15 minutes after adding chemicals in order to prevent the corrosive off gasses from damaging your pillows, plastic parts, and cover.
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Info from: Lisa Thompson, MasterSpas.com