[VACList] adding water filter under sink

["C. Hale" <chale@xxxxxxx>]

Hi,
I'm ready to install a water filter under the sink of my 59 Traveler while
the cabinet top and sink are out.  I need some advice from those who have
already done this please:
  -1 Did you re-direct the inflow so that both the tank filled water and the
pressure connection (hose) water both go through the filter before it goes
anywhere else?  Or do you just filter the water coming into the cold water
faucet?

  -2 My copper plumbing is a combination of sweat and compression fittings.
There is a big compression joint after the pressured water entry.  Could
this be a check valve?  Do I need a check valve there?

Thanks for your help.  I'll watch for your replies.
Cindy