My 88 Hunter 26.5 has two separate bilge sumps over the keel bolts. They are not connected as water cannot go between them. The forward sump is where my bilge pump is and never accumulates water. The same green anti-freeze has been in there for three years. The aft sump always has water in it to about 2" below the cabin floor. Whenever I pump this aft sump out it slowly fills again to that same level. The water is not coming from above so it must be coming in from below the cabin floor. I don't have a hole in the hull or the boat would sink. Is there an annular space between the cabin floor and the hull that could hold water? If so, how can I drain it better? Is there another access point? Carrying around all that extra water has got to slow me down not to mention the problems associated with freezing.