I would suggest you take a look at Peggy Hall's Book, "How to Get Rid of Boat Odors". It covers how to attack this problem from many angles. Boat odors are often a multi-layered issue, and this small and inexpensive book gives you a system approach that I'm sure will help.
For what it's worth, my understanding is that you want to stick with the plastic tanks.
CS27 #1254 ~ Ravat
PYC, Lake Ontario
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