APPLIED MEMBRANES INC. Anti-Scale Filter Cartridge | Fits 20" Housing | Replacement Anti-Scale Cartridge 20" BB

I first ordered this 2 years ago. At the time, I got the replacement filter as expected. So... when I reordered the same thing this time, I expected to get a replacement filter, right? What arrived was a filter housing, complete with fittings, wrench, etc. - but no filter.The item listing is titled:"APPLIED MEMBRANES INC. Anti-Scale Filter Cartridge | Fits 20" Big Blue Housing | Replacement Anti-Scale Cartridge 20" BB..."The description, though, on closer inspection, appears to show that this is now a listing for a filter housing that can take a filter, which is not included. As a housing, though it looks decent, it's the same as I've already got and worth about $50, not the ~$150-200 I would expect to have paid for a replacement filter.The vendor needs to make it more clear what is being sold here.