Filter
The amount of water will depend on the type of waterbed, since there are Hardside and Softside waterbeds in king size. The free-flow Softside, which contains only water, will take around 105 to 150 gallons. The waveless Softside will be on the lower end of that range because it contains fibers that make it waveless. The Hardside waterbeds range from 150 to 200 gallons of water.

There are a few different fluid chambers, which are waveless, semi-waveless, free flow, and hardside. The different fluid chambers offer various options to choose from and provide different benefits.
Waveless
Semi Waveless
freeflow
HardSide
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