You will see a warning on the heater pad to have at least 8” of water in the mattress.
Your
trays will not bottom out if the bag is filled
properly. The
warning is there so that a person will not be burned on a regular
mattress if there is not enough water for full support.
When
you are done with the bag, drain the water. DO
NOT LIFT THE BAG! Siphon the water out with a hose
or plastic tube.
Reinstall the plug, and ROLL up (rolling
is preferable to folding). Store at normal room
temperature where it is not likely to get punctured
or abraded.