Hi, I own a 1994 Catalina 42 Mk 1 and am having problems with the aft holding tank. I have had it pumped out about 3 times in the past month. There are just the two of us using the boat. The pump out appears to remove many gallons worth of "stuff" each time. However, after just a few times using the aft head after a pump out, the waste discharges through the vent on the transom onto the swim platform, leaving a mess. Has anyone seen this problem before? What is the recommended solution? Regards, Gene Musante Senior Disaster Recovery Manager email: gene.musante@fmr.com Tel. 617-563-3512 Fax. 617-385-1446 Pager 800-759-8352, PIN 189-7932