2nd Skin
We were experiencing an odor problem on our Hunter. Clean head and replaced hoses did not rememdy the problem. Drained the holding tank and sanitized it but still the odur persisted. A surveyor friend suggested installing a bilge drain for winter storage which will allow the bilge to drain outside without engaging the pump. We began to drill the hole from the inside of the bilge and once the floor of the bilge was penetrated, an absolutely disgusting liquid began to ooze into the bilge. Once the hole was through ( on the starboard side about 2" from the center of the keel, this liquid drained out. The odur was so strong that it was noticed by people 4 boats away. I installed a stainless receptor and epoxied it in place and the receptor accomodates a threaded plug. Now when the boat is hauled this 2nd skin can be drained. This year as well as last, the liquid which came out was only water. Apparently this is quite common on the 31 models. Somehow, liquids, over the years, have drained into the area below the bilge and without anyway to drain the incumbent microbes decay and rot and while doing so smell really, really bad. The odur problem has been resolved.