Spas made by Marquis Spas need to be drained every three to four months in order to clean out and -- if necessary -- repair the insides of the spa. Because this is a regular maintenance issue, Marquis Spas all come with a simple drain system already installed. All you have to do is use it.
Unplug or otherwise turn off all power to the spa.
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Locate the hose connector on the outside of the spa near the bottom of one of the sidewalls.
Remove the bib plug from the connector piece, then screw your garden hose onto the connector. Place the other end of the hose somewhere where there is adequate drain-off or where you won't mind a lot of water being pumped.
Open the equipment compartment panel on the outside of the spa and locate the drain valve. It will look like a T-connector pipe with a knob coming out the top, and two hose pipes will be attached to either end.
Open the drain valve by turning the knob counterclockwise. This will begin the draining process. Allow all the water to flow out of the spa.
Close the drain valve, disconnect the hose and reinsert the bib plug into the drain connector piece.