Hi pe2e
thanks for your advise I tied the pump up as it is plumbed into the sink drain, but it did`nt make a lot of difference so I got the filter out and soaked it in white vinigar and used a spray bottle with the vinigar in and sprayed all inside the filter then scrubbed it with a toothbrush (it was thick with scum) then I put white vinigar inside the little rubber drain hose, the smell has gone and the water is coming out the drain hose faster so it seems the filter was the problem.
Maureen Morley
February 2007