Nalgene filters always crack!

Hey guys. This is my first post! Yeah for me.. Anyways besides introducing myself, I'd like to know if you are having the same problems as me. When I brew my stuff, the top and bottom of my Nalgene filters get very fine fractures while filtering.. I only pump my pump to about 5-6psi. If I don't bottle my stuff right away, it will slowly leak out of the fine cracks.. Am I the only one.. can someone suggest a higher quality filtering set up?

Thanks in advanced.  

Well I'm not familiar with nalgene filters sounds like you have a good set up with pump, not just using syringe filters and getting sore thumbs. Anyway, I'd see what 'whatman filters' have available I know they have just syringe filters but they might have other types available.