Whirlpool NL300 water filter cartridge doesn't turn
I have a Whirlpool side by side refrigerator circa 2004. I want to install a new water filter (NL300). The directions say to turn the filter 1/4 turn on both the removal (counterclockwise) and installation (clockwise), but the old one just slid straight out and the new one won't turn when I slide it in the slot to install. I raised the arm on the icemaker to stop the water flow. Is there anything else I should try?