all it is a water filter that is mounted between the water pump/city water inlet and the faucets.
on entry-level RV's, like the Puma, this is any option, whereas it's a standard item on other RV's.
they usually not much different than the ones you find at HD or Lowe's and don't require any electricity. just water pressure, like at your house.
they use the same cartridges that the home ones use.
works on city water hookups or using water from your FW tank.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package