After I became aware of this pillow, I've read the reviews and decided to give it a try. I have to say it's perfect. Have 4 liters of water filled and thus come from the beginning prima clear. I am the side sleeper and can not agree to a previous review ("... nothing for side sleepers"). I always sleep on the side and it goes great with this pillow. Have to say, I do not lie directly in the middle, but rather on the edge of the pillow - wonderful! Although in the description, that if all pouring tap water, no chemicals needed the Wasserkonditioniertabletten I've ordered from Amazon here and 1/2 filled (according to the seller, but also a whole tablet - for 20 - 30 liters of water - no problem). I can not imagine that the water really is 1 year stays fresh without my assistance. Thus, I hope in eternal life, because I do not want to give up: -D
