I bought this over the summer, it works well. Amazon.com: CLEARSOURCE ULTRA RV WATER FILTER SYSTEM - NOW WITH VIRUSGUARD... (https://www.amazon.com/gp/product/B07SX5RPG6)
The downside is it is kinda big and has to be outside. I would like to mount it in the bay area with the hose and electric reels. I searched and have seen some done with 2 but not 3 filters like this Has anyone done 3 and if so, can you share your setup?
I put 3 10 in big blue water filters in my wet bay on the passenger side above the water pump. The first one is a spun filter for large particles. Then it goes to a KAF carbon block filter and finally through a ceramic bullet filter. It worked fine for me except for in Maine where the hardness of the water blocked my ceramic filter immediately and now I'm having the same issue in Mexico. But I have the parts to bypass my ceramic filter so I'm going to be putting that in tomorrow. The only other thing would be a ultraviolet light hooked up to a separate drinking faucet and I'd be covered against pretty much anything. So far I haven't needed it. Anyway. That's what I use. Use. It's more maintenance and more costs. Changing the filters but I believe in clean water so that's why I do that.
Funny this topic came up. I just took out my old three 10 inch RO system with an extra 10 inch water softener filter in a separate canister. The RO unit wastes a little water but not much. My new RO is pretty narrow with two 10 inch filters with the other two on top. I do have the extra 10 inch water softener cartridge and then added a mineralizer into the line to the RO faucet. There is room in the wet bay of our U300 to install all of this. The RO filters complete was about $34 delivered with another $20 for the soft water and about $12 for the mineralizer. I have the option of flushing the membrane at my convenience. The water softener cartridge also raises the PH so it's slightly alkiline.
You do need a little tank under the sink that holds a gallon or two. Perhaps the whole thing would fit. I used screws not seated so I can lift the unit about 3/4" and lift it out to change filters. The 1/4" lines are coiled so nothing has to be unhooked to pull it out.
I bought the RO unit off FB Marketplace for $60. It looked new but I bought new cartridges for it. Our old one treated 14 gallons a day. The new one does 150 gal/day.
I also purchased a TDS digital indicator to test the water. Out of our well, it indicated about 287, after the RO unit, it indicates 47 and after installing the mineralizer, it indicates 57.
The RO removes all the minerals from the water and adding some back is recommended for humans. These units are normally used for greenhouse gardeners so no mineralizer is used.
Pierce