Draining a Spa
Change of Water
Depending on usage, the water is your spa should be changed approximately every 3 months at the least. Even if the water looks clean, the use of your spa chemicals on an on going basis may make the chemicals less effective.
Upon each change of water, it's good practice to wipe down the spa with Citra Brite, Gel Gloss or Fast Gloss.
Turn off power to the spa. Never run spa while draining or empty!
Open the access service (door). Locate the drain valve, and then remove the cap 
from the valve and screw on the end of a garden hose. Never Supply Water To The Spa By This Means!!! Turn down the heat to it's lowest setting. Route the garden hose to a place suitable for draining water and open the spa drain valve. Note: Some models may take a couple of hours to drain completely. Once Drained, close the valve back to closed position and install the cap back to the spa drain hose. Do Not supply power again until the spa is refilled! Once filled run the spa until there is good water flow and all air is bled from the system. Once this is done, turn heater thermostat back to the desired setting.
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