"Worked great until it broke" - Review of MSR MiniWorks Ex Water Filter

I was using my fairly new pump in Algonquin Park this past summer. I noticed it was developing a lot of pressure, to the extent that water was shooting out of the relief hole near the threads. I continued pumping and boom, the pump head blew up!. It cracked and literally exploded under the pressure. The pump was assembled correctly and the filter was super clean, so I'm not sure if I was pumping too fast or what. The instruction say to pump 70 - 80 strokes per minute, which I find it hard to believe anyone could pump that quickly without it exploding under the pressure. I contacted MSR, and the rep told me it could only be from a dirty filter or clogged umbrella valve. Neither was the case so I am baffled. I sent the pump head back and MSR sent me a new one out within two weeks, so kudos to MSR on that front. I will be using the filter again extensively soon, so I hope I don't encounter tha same problem. I have read so many reviews that state this thing is nearly bombproof, that it makes me wonder if something was wrong with mine from the factory. Nonetheless, it is a great filter, just be careful not to create too much pressure while pumping.
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