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Yes, the shore connection is also treated by the Watts before human consumption. I put the Watts module under the sink in the galley. I tied it into the connection that was already present for the Insta-hot, then took another line over to the refrigerator with another "T" connector. My normal sink water is not R/O treated, so it would come straight from the tank or the city connection. I hope this explains my set up better. Tim

Hello, I just installed the Costco Watts reverse osmosis system about a month ago in our motorhome and it works great. I send the drain water back into the main water tank since it is not all that polluted anyway and that water is only used for washing dishes, laundry, showers, etc. The super clean reverse osmosis water is sent to the refrigerator to make ice cubes, cold water for drinking and it is also sent to the insta-hot faucet for making hot drinks with super clean water. I add some bleach to the main water tank normally to kill any bacteria that may come from adding water during our travels. A sediment whole coach filter is in-line right after the main water enters the coach before the main tank. The charcoal filter ( an additional one, because the unit from Watts also has one), is before going into the regfrigerator. I have installed Culligan systems and Watts systems before in differing applications, and the new one offered at Costco is about the easiest one I have ever installed. I do not use the faucet that comes with the unit, and I have to purchase additional fittings to route the system where I desire it to go, but the end usage of this system is wonderful. We have sediment reduced, bacteria treated, and reverse osmosis treated water all from a single, simple system. You will need at least 40psi for the system to work effectively. Hope this helps and encourages. Thank you, Tim Sparks