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The stand up safety liner is designed as an extra safeguard against unlikely leakage of your waterbed, and "stands up" inside your hardside waterbed's frame.
How to correctly install the stand up safety liner:
The safety liner must be installed so that it reaches the top of the frame perimeter. Fit the corners of the liner to corners of the frame. Smooth out all wrinkles over heater pad. It should be capable of holding the entire contents of the water mattress. Do not fill the mattress above the safety liner.