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Handrail: Rails used to aid in entering or exiting a pool or spa. Variations include existence in or out of the pool, or as a part of the stairs.

Hardness (Calcium): Total hardness in the context of pool water refers to the total mineral content dissolved in the water. This is made up of calcium, magnesium, iron, manganese and other elements. The ideal range for calcium hardness is 250-350 ppm. If the calcium hardness is too low, the water becomes corrosive and results in the degeneration of pool equipment such as pumps, filters, and heaters. To combat this corrosion, calcium chloride should be used. On the other hand, if the calcium hardness is too high, the result will be scale formation on all pool surfaces resulting in clogged filters and pipes; reducing water flow and filtration efficiency. Signs to watch for are the pool water becomes cloudy and swimmers will complain of eye irritations. Product suggestions: Hardness Increaser in 4, 8 and 25 lb. pails.

Heat exchanger: An indirect pool heater that transfers heat (through a solid) from one fluid to another without mixing the two fluids which is the main heating feature of a pool heater.

Heat Pump: A direct pool heater in which a fan pulls warm outside air past Freon gas, transferring the latent heat in the outside air to the Freon gas that is being pumped through a condenser coil. The heat is then released to the water in the pool as it passes by the Freon gas in the evaporator coil. This process's efficiency depends upon the amount of latent heat in the outside air and the relative humidity. The cooler the outside air and the lower the humidity, the less effective the unit is in heating the swimming pool. Product suggestions: Above Ground Pro 600 Heat Pump, In Ground Air Energy AE2000 Heat Pump

Heater: A device used to heat the water of a pool or spa. How does each one work? Direct Heater: Heats the tubes through which water circulates. Electric Heaters: Elements submerged in water use electrical energy to extract heat from the air, upgrade it with a compressor, and then transfer it into the water. Product suggestions: Above Ground Pro 600 Heat Pump, In Ground Air Energy AE2000 Heat Pump. Fossil-Fueled Heaters: Natural or Propane gas is burned in a combustion chamber whereby the heat is then transferred into the pool water. Product suggestions: In Ground EnergyRite 2, Raypak® HP Pool Heater. Indirect Heaters: Circulate steam or hot water inside an exchanger through which water flows. Solar Pool Heaters: Transfer energy derived from the sun's rays to heat the water as it passes through the solar panels. Solar Pool heaters are available for both in ground and above ground pools!

Hot Tub: A spa constructed of wood.

Hydrochloric Acid: A strong acid used to regulate the basicity (pH) of pools and spas.

Hydrotherapy Jets: Blends air and water to create high-velocity, turbulent streams of air enriched water.

Hypobromous Acid: A primary chemical compound responsible for sanitation in pools and spas treated with products based on chlorine or bromine.