you can always use a stanley blade and run it down the glass to get the film off, or some white spirit, meths (one of the two.....)
the filter?... its decent... 700L/H, i keep it in a 60 litre tank turned all the way down... the size of the actual filter inside it is HUGE, one of the main reasons why i am keeping it.....
i still have the original foams, and they are in, and so is a lot of other foam, ceramic rings/noodles and plastic balls..... it's one of the most versatile filters i've ever used... apart from my jetflo 100