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you're comparing apples to oranges. Lectrasan is a treatment system, Vacuflush is a head; you can have both...
Lectrasans are legal except in NDZ (no discharge zones) like some harbors, lakes and the florida keys. I dont' know if the Great Lakes are an NDZ, probably.
If they are an NDZ, all you really need to do is add a holding tank if you don't already have one. It's not a big deal, you just need to find a location big enough for the tank you want to install, somewhere accessible and not too far from the head or along the lines from the head.
engine room, under the floor at the bow, etc... where is the lectrasan right now?
Then you just route the hose(s) coming from your head(s) to the holding tank.
To empty the tank, all you need is a deck fitting and hose going to the tank for pump out.
If the lectrasan is working and if you plan on using the boat in areas where it is legal, you probably want to keep it. In that case, you would use a Y valve to select either holding tank or lectrasan for the waste coming from the head(s)
Note that Raritan has introduced a system called Hold N Treat which pulls waste from teh holding tank and process it in the lectrasan. It's worth considering as it gives you the best of both world.
A note on Vacuflush... they have two benefits. first they use fresh water which eliminates some of the odor caused by raw water (although in the GL it probablydoens't matter...). Second, they use less water than conventional heads which allows you to use a smaller holding tank... or go longer between pump out.
note that there are some regulations to be aware of. like having a lock or remove the handle on the seacocks for waste discharge. Same with Y valves... if your boat has a Y valve to select Lectrasan/holding or direct overboard, it must locked or the handle must be removed.
hope this helps... otherwise tell us exactly what you have (number and model of heads, etc...)
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