I don't think I'd like that. The food stuff from the fridge and shower do not necessarily sink, and may well be picked up as you flush into the head....On the later model 310s the outlet for the shower sump and refrigerator sump is the seacock for the raw water inlet for the head. ....
They obviously heard about a good idea and then screwed it up trying to improve on it...confirming what I've said for years: boat builders are the WORST sanitation system designers (assuming what they do can even be called a "design") on the planet. They do what costs 'em the least, whether it it's a good idea or even makes sense.On the later model 310s the outlet for the shower sump and refrigerator sump is the seacock for the raw water inlet for the head.
Teeing the pump's supply side to the sink drain should be okay, and you just fill the sink to flush.cross comtamination of the fresh water system.
There have been a lot of threads addressing your concern. search for them, and you'll be enlightened.My concern, other than "wasting" fresh water, is with cross comtamination of the fresh water system. Back flow might not be likely, but....? I don't know if the system would be protected?
You put the T in the sink drain. The T is from the drain to the head. You put water in the sink through the standard spigot. There is NO connection between freshwater supply and head.Teeing the pump's supply side to the sink drain should be okay, and you just fill the sink to flush.
Except for the Raritan Fresh Head FRESH_HEAD Promo Sheet which is designed to use pressurized fresh water, there's no safe to way to connect ANY manual toilet to the fresh water plumbing. However, as Justsomeguy noted, connecting the toilet intake to a sink DRAIN doesn't connect it to the fresh water system...making the it only safe way to supply fresh water to any sea water toilet, manual or electric.I too have toyed with the notion of converting to a fresh water flush for our two manual PHII heads. (I pump about 2 or 3 gallons of fresh water out the bowl when we aren't going to be on the boar for a week, or more, just to keep the pump and lines in better shape.). The raw water supply does get a bit stale and smelly until we flush it out after a week or so.
My concern, other than "wasting" fresh water, is with cross comtamination of the fresh water system. Back flow might not be likely, but....? I don't know if the system would be protected?
If you don't want to spend time searching the archives, all this is covered in detail in my book (see link in my signature).There have been a lot of threads addressing your concern. search for them, and you'll be enlightened.
You'll use a lot less flush water after solids because the bowl won't need much cleaning if you add about a pint of water to it ahead of use. If your toilet isn't one that can bring water in and hold it in the bowl, use a beer cup from the sink.For no. 1 you can switch to wet and flush and it pulls enough water for that fine. For no. 2 we put the drain plug in and flush for super flow. Cleans the bowl nice and quick.