Moonbeam,
Many thanks, I thought about this but did not know whether the flaps in the trunking that I think are suposed to reduce the water flow comming in when you remove the unit, would be in the way. I thoink I am going to have to give it a go as when I am lifted out the strops could well damage the the flaps and I will need totaly new unit not just the impeller.
Keith and Carole.