How to Drain a Waterbed Mattress

Hook up the hose from a waterbed fill and drain kit to the mattress. Put the free end of the hose into a tub or somewhere else you can drain the bed into.

Sit on the bed to drain it. At first, the water will flow out freely. As it gets lower, you may want to roll around on the mattress or get some other folks to sit on it with you to help get the last of the water out.

Use a siphon to get the puddles left over. Unhook the hose and run a thin rubber tube into the bottom of the bed. Strtch the hose out through the window and down to a position lower than the water bed. Have a friend position the hose so that it is in the middle of the remaining water in the bottom of the bed. Suck on the end until the water starts to come out, then let it continue to flow on its own..

Finish it off with a shop vac. Use a wet dry shop vac with a long tube attachment to suck out the last few puddles in the bed.