"MaxAluminum" wrote in message
I suggest you get a model that uses the standard size filters (11.5" I
think). This way you can buy filters from different sources. You want
two cartridges so you can have a prefilter and a final that does
something specific for your water source, such as heavy metal or bio.

The wound type filters are universal. The problems is only between the
GAC1-ss and the Insta Pure housing. they are the same length. Most filters
are hollow core. These are not and the outlet in the top of the housing is
longer than the depth of the recess in top of the Omni cartridge. The
Insta-Pure IR-10 does not need a pre filter as it is part of the cartridge.
Ed