To me that’s the way to go. That’s all we use. A filter installed in the water line behind the frig. As a manufacturers rep we can’t even get a discount on the filters from some manufacturers. In some cases they won’t even list a part number. I don’t think they are worth the money. The bypass is for if your filter stops up or another issue. Just that, it bypasses the filter altogether. They would never suggest you buy a $10 filter to put behind the frig vs buying one of their own