The number one complaint we have found with mattress comfort is caused by improper mattress filling - frequently caused by overfilling.

How much water is enough? This depends somewhat on the style of mattress. We recommend filling until approximately level for most sleepers.

Adding or subtracting water can change the feel of the bed a great amount.

With fiber mattresses rated over 95%  waveless rating, more water makes it appear softer and less water makes it appear firmer.

With a mattress of 90% or less waveless rating, the mattress should be filled to accommodate the largest sleeper for the bed. In this case more water is firmer, less is softer. Overfilling too much will stretch the vinyl.