Winterized my TT Sunday evening.
Took less than 2 gallons.
A replacement water filter can be purchased at almost any location that sells hardware. I've seen them at Wal-Mart, Lowe's and Home Depot. I bought my last filter at Do-It Best
Forest River calls for a (0.5) Micron replacement filter, rated at 2.5 gpm. (One Micron = one-millionth of a meter)
Being we don't use our on-board water, or city connection for drinking(bath & toilet only), I bought a 20 Micron replacement cartridge
with a rating of 12 gpm.
also to order on-line.
, Part # W20CLA.