I just got a Frontier Pro inline water filter. I screwed it to my 1L Platypus but the water leaks around the intake. I've screwed it on as tight as it can go, but there is a gap and water still comes out between the filter and the platypus. If I were using this as a gravity filter, contaminated water would be running right into my clean water.
Do I need a washer? Does the filter not work with platypus?
