Permeated hoses are the FIRST thing to check no matter how new the boat or how long ago hoses were replaced.
Btw, Chris...Parks Masterson--"HopCar" here--owns Hopkins Carter marine supply in Ft Lauderdale and gives forum members very discounts. I recommend you ask him for quote for your PuraSan system.
Not ALL the "expensive" hose permeates. Trident #101/102 (identical except for color) has been on the market for nearly 20 years without a single reported odor permeation failure.and for an average price of $7.50-$8/ft isn't THAT expensive. It has only one drawback: it's stiff as an ironing board, which requires using inline radius fittings for tight turns. Raritan introduced their Saniflex hose about 6 years ago...not a single permeation failure so far and it's so flexible it can make a U-turn.
That's because boat odors aren't ALL in your head!
Thought that was assumed. Ted