S/V Lilo, Islander 32
Join Date: Apr 2008
Location: Lafayette, Oregon
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RV's are square, so square things fit in nicely. Boats are not, and square things on a boat waste a lot of space around them. It is not uncommon to have all sorts of fully shapes in tanks on a boat, whether for fuel, waste or water.
I too have a built in bilge tank in my 1964 boat. I think this practice has gone my the way side in favor of cold molded, funny shaped plastic tanks. Likely this change occurred mostly due to the easier manufacturing of such tanks these days. 40 years ago they where harder to make, so just molding in a void in the hull was easier.
Personally I do not see much of a difference in the two. I like the fact that mine is in the bilge as the water stays cooler, but I do worry a bit about intrusion of bad water from the bilge as the after market, home made inspection port is not the greatest, and I have yet too figure out how to remedy that.
I say clean it like any other tank and see how they come out.
1964 Islander 32
Saint Helens, OR