Hello all!
I really love my little MSR HyperFlow filter - it has many benefits. Many people have complained about how fast it clogs up and how the back-flushing procedure does not fully restore flow. I have also experienced this problem, especially after filtering pond or lake water (or stream water high in tree tannins).
In order to help dissolve the gunk that builds up in the ceramic tubes that make up the filter, I tried mixing two tablespoons of citric acid (also know as "lemon salt") or "acid blend" (used in winemaking) into the filtered water I use for back-flushing.
Wow - what a difference! With just one back-flush the filter is restored to normal operation. It really works well if use sub-boiling hot water.
Has anyone else tried a procedure like this? I was planning on sharing it with MSR to get their thoughts. I do not believe that the citric acid blend will do anything to hurt the filter.
Thoughts?
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