Both the forward shower and the aft tub drain very slowly despite all our efforts to remove hair and gunk. Carver manual says not to use caustic drain cleaners to avoid causing damage. Looking for suggestions for what to try next! The water seems to drain into some kind of holding tank and then pumps out from there. We have no idea where that tank is located nor what pump actually pumps it out.

FWIW the idiot mechanic who was supposed to winterize the boat poured RV antifreeze into every tank but didn't run it thru the lines. As a result we had several broken and leaking lines when we returned in June. We hope they've all been found and repaired or replaced but... no idea if this could be related to our slow drain problem but thought it worth mentioning.

Thanks for any help or suggestions!

Sherry
Toucan Do
Anacortes, WA