We already use the brand for many years and are more than satisfied. We have a dual Softside waterbed 2mx2,20 m and us the brand was recommended when buying our waterbed and have each settled 1x times. We use half a bottle per Wasserbettmatraze hälbjährlich.Seit five years we will have no problems. The 1. Spay is now slowly after 5 years to run out. Honestly, why buy expensive in waterbed business? We know of no reason and can highly recommend Aqua Nova.