A:Answer If you don't turn off the water supply before changing the LG LFXC22526S refrigerator water filter, you risk uncontrolled water flow and flooding, which could damage the filter housing, floors, and surrounding areas, and make it difficult to install the new filter properly. To avoid water leakage and costly water damage during filter replacement, it's essential to turn off the water supply valve. If you have further questions or concerns, you may send us a private message on social media using @LGUSSupport. We're here to help. ^Win