When our broker commissioned our new Lagoon 400
, he pretty much insisted on the fresh water changeover right away. It has worked just fine.
Unfortunately, the Lagoon
design has the holding tank
so far away from the toilet it's basically in a different country. This means a great amount of fresh water is used to make sure the stuff gets all the way to holding tank
(or through the holding tank to the sea if the valve is open). I think it has a significant impact on our water usage, and you should account for that.
Also if I were to do it again, I would have a Y-valve installed so it could be switched back to salt water
if something goes wrong or you needed to conserve fresh water.