Unfortunately generates the irrigator in position 'max' only a very gentle stream of water, which hardly changes when adjusting the nozzle between soft-, and massage jet. Thus one can by no means clean between the teeth! The device is completely unsuitable for its intended purpose! I have it sent back to the supplier K & L-Topshop, Hamburg PS I had in 1991 purchased a AEG Oral Care Center Aquadent. This unit took until today only a new nozzle holder, which is now broken. However, there is no more spare. It has indeed 18 (!) Years working fine. I thought the 'irrigator AEG MD 5503' would be similar, but far from it!