Head Backing Up

[Debbie on OTTER]

The head on our 30' Sabre periodically backs up. It has been pumped out and the joker valve has been replaced. Any suggestions as to what might be causing this annoying problem?

[sck5]

Get Peggy Hall's book!

Amazon.com: Get Rid of Boat Odors: A Boat Owners Guide to Marine Sanitation Systems and Other Sources of Aggravation and Odor (9781892399151): Peggie Hall: Books

[zeehag]

check yer vent. read peggys book. have fun.

[Intentional Drifter]

Hi, Debbie, and welcome to CF!

We need more data to be of help:
Is the toilet above or below the waterline?
Sea water or fresh water flush?
Is it "backing up" with clear water (from the feed) or with "used" water from the holding tank?

If it is clear water and your toilet is below the water line, do you have a siphon valve in the feed water line? If so, the valve in the siphon break may be clogged or stuck. If you don't have a siphon break, you need one.

If it is "used" water, and you have sea water feed, then your sanitary hoses may be clogged/calcified -- this is quite likely to be true if they are 4 or more years old. You could also have a clogged/calcified Y valve.

Peggy's book, by the way, really is the "bible" of such things.

ID