Why are tube and cylinder systems not considered to be proper waterbeds?
Only full-depth, single-cell waterbeds with a water depth of at least 20 cm can guarantee the required physical displacement principle of the water, just like a fish or a ship in the water! This is the only way we can we be sure of achieving a perfectly even distribution of pressure and support and unbeatable levels of comfort. With the cylinder or tube systems you end up lying on three tubes filled to bursting point which do not allow the surface pressure to be properly distributed. High pressures mean short life expectancy. This is why they are marketed with the advice that the tubes can be changed one at a time when necessary. The only problem is that the leaks only become apparent when you see the water running out! A bed with water, yes, but it isn’t a waterbed. There are, of course, some exceptions to this rule: for example, certain orthopedic problems which require the spine to be positioned at a higher level than the shoulders as occurs in special cases of Bechterew disease. Im
