Last week I asked for help identifying my house water filter.

It's a Honeywell-Braukmann F76 with 100 micrometer cartridge. The
manufacturer web site says it never needs replacing as long as it is
backwashed periodically.

OK, dumb question: I assume this means take out the cartridge and rinse it
off. Correct?

How often? My house has 3 full baths.