Well here is my new to me RO. I haven't gotten ahold of a manual for it yet. It is a 6 post (4x40) culligan. Was just removed from service and working well as far as I know. My plan is to get new membranes, probably bypass the extra non essential electronics, and add a feed pump. Has anyone seen or converted one like this. I'm not an expert on them but I do currently have an RO and plan on just adding this to my fleet.