BroadHopper,
Are you looking at just a tank replacement or tank and leaching field?
I have a septic system (new) on an Island and I used the Biodiffusers for my leaching field. Very simple installation as compared to a conventional system.
Septitech is a proprietary product and there are others. You have to be careful with the plastic tanks for concerns about bouyancy in high ground water situations, meaning the tank will actually float if not filled with liquid, say, after having it serviced or pumped. I realize this may not happen much on an island. The technology of septic systems is constantly changing.
Good Luck.
Blue Thunder
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