Our pool was re plastered in FEB of this year. Bought a new Polaris 280, recently I noticed the floats and the hose have like a sludge (black) attached to them. Also the tires (two) that are powered have like a gooey material alongside the edge that is contacted by the center power wheel. Also the tires seem to feel sticky. Any ideas out there as to what could it be? Its a fresh water pool, chlorinated.