Rainsoft EC-4 info needed

[crbapple]

Hello, I’m considering buying a used Rainsoft EC-4. Can you tell me what replacement filters and membranes I’d need, and where I can get price info.?

[crbapple]

From the information I can find, the Rainsoft EC-4 looks like a water softener and not a water filter or a reverse osmosis system. A water softener peforms different functions than a whole house filter system or a Reverse Osmosis system.

A reverse osmosis system contains a membrane and is generally located under the kitchen sink. You can find a good one here:
PuROTwist 3000 Reverse Osmosis System and PuROTwist 3000 Replacement RO Filters


You can get an UltraFiltration System which can be used to filter the whole house and has a replacement membrane:
Pentek U440 Ultrafiltration FreshPoint Water System and Pentek 160380 Whole House Ultra Filtration


The BBFS-22 system is a whole house filter system. It doesn't have a membrane but has two filters for filtering sediment before the water softener so it doesn't clog the softener. They are located here:
BBFS-22 Big Blue Water Filter System with mounting bracket for whole house water filtration

Thank you,
WaterFilters.NET