i have nice rebuilt ro it has brand new membrain new fillerts new every thing does 150 gpd this ro hads no di so please dont ask i dont belive in them but yes u can add one if u wish im looking to trade it for fish stuff lookinf to get 100.00 out of it so please let me know what u have to trade ill trade abought any thing thanks u want a brans new ro thay are 200.00 u need filletr i have them u need membrains i have them u need tds meters i have them