LG Refrigerator LRFXS2503S Water FilterYour LG LRFXS2503S water filter is one of those things you dont really notice until the water starts tasting off. It uses a trusted LT1000P replacement water filter, made to fit right and keep everything flowing smooth. No hassle. Just works. It helps improve water quality with every pour, cutting down chlorine taste and everyday impurities. And yeah, its NSF Standards 42 and 53 certified, so its actually doing what it claims. You might not think