There is a 3/8" drain line by my refrigerator. I hooked up a reverse osmosis filter to the refrigerator which drains through the 3/8" line. Lo and behold, as soon as it started draining, I discovered that water was coming out of another 3/8" drain line under my kitchen sink.
Is it okay to simply put a stopper on the 3/8" drain line under my sink and still have my filter draining through the other line?