Along with your system you should have received a Rainsoft information packet. Typically in this Rainsoft manual there will be a list of the correct Rainsoft replacement filters. This list should include the Rainsoft part numbers for all of the filters. If you cannot filter the Rainsoft part number for all of the water filters that you need you can simply provide us with the Rainsoft model number of the Rainsoft Reverse Osmosis System that have under your sink and we can help you find the correct Rainsoft replacement filters. A full selection of our Rainsoft Replacement water filters and reverse osmosis membranes can be found here:
http://www.waterfilters.net/Rainsoft...ers_c_162.html