Ametek PS-C1 Replacement

Hello,
I have a 1996 Country Couch motor home.
The main filter to the water system is in a bay under the coach and the only number I can find is “AMETEK PS-C1
I haven’t had much luck finding a replacement.
What filter do I need and how much are they?
Thanks
(I would like to order six of them for spares)

Seems the be the C-1 filter.

What’s on your mind