Fresh Water Leakiness
John,A tiny, lower inaccessible crack in my Oceanis 390 plastic port aft tank had been repaired badly by a previous owner. I first drained all tanks and then filled each of the three tanks one by one. Pulled every floor board. Checked the bilge area in between each filling. Soon found the tank culprit and one union. Removed the tank, had it plastic-welded properly, gently tightened a loose union and presto!!!! no more swimming pool under the sole. Javexed all the tanks. I am totally anal about a dry bilge. A wet bilge is a sign of a damp mind.Good luck,Capn. Pete