Yes you are right, there is no way for the shower tray to self drain and we will use a use a shower sump pump to dispose of the water. The question is, should we pump it out to the holding tank or outside the boat?
We have send a few emails to people who operate on the canal du midi about the local water disposal regs and are awaiting for answers.
Back to the engine, as you know Kents have not much space under the engine and the bilge is small and very awkward - so i guess a filter on the outlet is the only option. What sort of filter would you recommend for that?