The Kenmore Base Grille Water Filter Makes Clean Water Easy Is it time to replace your Kenmore Base Grille Water Filter ? You should do it every six months or every 120 gallons of water. Having filters on-hand keeps you prepared and your water tasting clean and great. Far less expensive than buying bottled water or even the pitcher filters, which don’t have the same long life. Regularly replacing your filter is an easy way to have pure, delicious ice and water right at your finger tips.