The use of underwater ball bearings made of metal is out of the question. The lubricant is washed out or degraded by external influences and the ball bearings run dry. Special ball bearings solutions made of metal rely on the use of external lubricants to ensure long service life. The problem was in finding corrosion-free ball bearings for additional guidance of the motor shaft under the propeller and the first shaft seal.
The xiros radial ball bearings made of the xirodur B180 material are used for the additional guidance of the motor shaft under the propeller and the first shaft seal. The demand for self-lubricating and corrosion-free solutions led to igus. Another advantage is the suitability of the bearings for the smallest and hard-to-reach installation spaces. In the Poolwonder the bearing is enclosed between two seals, whereby a relubrication is hardly possible.