Can I add a water softener to my RV? July 10, 2024 at 3:09 pm #41267 matt.mcdonaldParticipant Joined: Feb 2024 Posts: 24 Likes: 11LikeUp1::FWIW, I wish I had got the 16000 grain instead of 8,000. I feel like I’m regening the thing every week. That said, we use a lot of water and are in AZ, where the water is as hard as a rock.