I recommend you look at a Raritan Electro Scan with a salt feed tank for use when you're in fresh water. You don't need to buy the special tablets that you need for the Purisan.
On the other hand the Purisan draws less power and some people say it needs less maintenance. It does cost more but not twice the cost of an electro scan.
I think the usual way to deal with no discharge zones is to put the sewage into the tank first then treat and dump when it's legal.
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Parks Masterson
Retired from Hopkins-Carter Marine Supply
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