Fits the tray perfectly but the Vapofil scent starts fading around hour six

I picked up a pack of Vapofil refills because the OEM pads for my bedroom humidifier are getting ridiculously expensive. From a strictly mechanical standpoint, these are spot on. They slide right into the little side tray without needing to be trimmed or wedged in, which was a massive relief. The initial blast of menthol and eucalyptus is exactly what you want when your sinuses are packed up and you just want to get to sleep. However, I did notice a slight drop-off in longevity compared to the name brand. When I load a Vapofil pad in at ten at night, the vapor is incredibly strong, but by the time my alarm goes off at six in the morning, the scent is pretty much completely spent. It is a fair trade-off considering what they cost, and I will definitely keep using them through the winter cold season. Just keep in mind that you might need to swap in a fresh one halfway through the night if you are dealing with really heavy congestion.