Guys its pretty important follow instructions when fitting a filter of any sort, all filters should have a 3-4 step instruction on the filter itself or have a small booklet.
The instrustions should show/read something like: fill up filter
: put filter on untill seal just touches
: turn filter 1 whole turn
The reason for following these is because if you over tighten it may be able to split the seal and therefore leak...
Just a little heads up