PEH,
I've seen it in marine supply stores like West Marine (if you have those there). As bad as the problem can be in our cars it's often worse for boaters.

Hotskillet,
If you have some algae in your tank and treat it with Bio Gard, you'll likely see more algae in your filter as it dies and floats down your fuel lines. Keep an eye on your clear (inline) filter and be prepared to change it more often. A couple of spare filters in your glove compartment is a good idea.

LRG

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold