"70% of what you really want in a filter."
Did this filter get the job done? Sure. Did I get sick? No. Great job right? Sort of. My issue with this product is that it required constant cleaning. Meaning after filtering under 10 liters of clear mountain spring water in the Sierra Nevadas this little guy began spitting water out. According to the instructions, this meant it required complete dismantling, a thorough scrubbing and rinsing. Okay, fine done and done. 4 liters later it's sputtering water out again. After about every 4 liters it required dismantling, scrubbing and rinsing. Bottom line, it worked. Just not as well as I would expect considering the price tag. I would have hated to see what would have happened if I had to filter silty water. I would have rather spent my time fishing rather than cleaning a fussy filter!
I just purchased this product to finally have my own. For the last 15+ years, my Dad and I have been using his (the original) and it has continously performed. I have not had the oppurtunity to use my new one, but based on my Dad's original one (and nothing appears to have changed) I can vouch that this is a product to count on in the backcountry. Easily field maintainable and effective product.