it stays level.they have a tunze osmolator and have it in the same chamber as the sensor.it is not the skimmer,they just arent good at getting it adjusted right.there is a plate on the bottom with holes in it.you use that to adjust the amount of water intake.then you raise the whole skimmer up and down to ajust the level.it is fairly simple for those of us who have the patience and general knowledge of this kind of equipment.