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Can you firm up the waterbed by adding more water?

firm the waterbedGenerally: no.  This trick only works for tube-water mattresses. Each waterbed has an ideal water volume, which can be determined by the mattress height, the shape of the mattress and the weight of its users.  How firm a waterbed feels, generally depends on the used stabilisation and the possible extra lumbar support in the water mattress.  Most brands offer a range of stabilisation levels from which you can make your own choice.