If you are talking about an RO or some prefilter... To my knowledge Rainsoft has never used proprietary disposable cartridge filters in any of their equipment.
Take the cartridge out, measure it remember what it looks like and go to Wal-Mart and other big box stores to buy a duplicate. You could take a digital picture of it on your cell phone or camera and take that with you.
If you are talking about a backwashed filter, you can replace the mineral yourself after buying it online or from a local dealer. Or find a local dealer to do it; that will be very difficult though because they will probably tell you that "it's junk, ya need a new one". Those that do that are just dumb but that's life. Next time don't buy national brand proprietary equipment like Kinetico, Culligan, Rain Soft etc... Buy from an independent online dealer and install it your self; it is very simple plumbing. Or hire a plumber.
Gary Slusser
22 yrs in water treatment and well pumps, 13 yrs helping people on the 'net to help themselves.
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