Water level is important, but most people don't get all the gas/air out of the bed properly; even a small one is right irritating, it lets the water get out from under you and balloons the surface of the mattress up.
Regular tap/city water has stuff dissolved in it, in addition to tiny air bubbles; as the water in the mattress sets, the air bubbles work out and the dissolved stuff also comes out as gaseous stuff. Most people just fill the mattress, burp it, treat it, and never futz with it afterward, so they end up with pockets anywhere from a week to a month later and usually don't realize it.
The top panel of the mattress should lay fully in contact with the water - you should be able to punch it and only get a small wave if anything. When the top panel of the mattress is laying fully on the water surface and can't lift away from it (which it does if there are gas pockets), it can't slosh and make waves; then when you lay down on it, since there are no gas pockets the water can't flow out from under you, so it supports you like it should. |
