Answer:

pur

Answer	Crossword Clue
PUR	Water filter brand
PUR	Chase start?
PUR	Brita rival

PUR	Brita competitor
PUR	Brita alternative
PUR	Feline sound: Var.
PUR	Sound of a contented cat: Var.
PUR	Cat sound: Var.
PUR	Buyer: Abbr.
PUR	Murmuring sound: Var.
PUR	Unsullied: Fr.

PUR	Contented sound: Var.
PUR	Big name in water filters
PUR	Big water filtration brand

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.