Abstract: An a.c. induction motor for use with a pump of a pool filtration system, the motor comprising a rotor and a stator, the stator (45) having at least two windings including a primary stator winding (46) and a secondary winding (50) magnetically coupled to the primary stator winding, whereby when the motor operates, a stepped down a.c. voltage is induced into the secondary winding. A pool filtration and chlorination system comprising an electrolytic chlorinating cell (10) arranged to be positioned within a filter line of a pool or spa, the filter line including a pump (11) driven by an a.c. induction motor, the secondary winding being electrically connected to the electrolytic cell, whereby operation of the motor causes a stepped down voltage to be induced in the secondary winding which powers the electrolytic cell.

Abstract: An electrolytic cell having a body adapted to be located so that the inlet and outlet are each on or adjacent the lower surface thereof and including electrodes whereby electrolysis of water passing through the cell can be effected, the arrangement being such that, if the water remains in the cell, then gas formed will displace water from the electrode so as to reduce, and finally stop, electrolysis.The cell may also have a third electrode which is located in the cell adjacent the upper surface thereof, which is in connection with one of the other electrodes, the resistance between the two electrodes being low when the cell is full of liquid, but high when gas displaces the liquid and exposes the third electrode.