User Review: MSR HyperFlow Microfilter
My first day out with this filter, I loved it. It was light, pumped fast and was compact. The honeymoon ended quickly though, as this filter plugs up faster than anything else I have ever used.
I have only used this filter in clean high Sierra water and followed the instructions on backflushing, but still found this filter USELESS after using it on a 6-night outing. Don't waste your money!!!