Of course, one or two trips later my filter only filtered at a trickle. I stopped carrying the back flush syringe for my Sawyer Squeeze system because I never used it in the many trips I made. Many of the gravity filters use the same hollow fiber membrane system and can stop working in the off season just from water drying and leaving minerals behind. This came up in a different thread, but is worth noting here also. I have never ran into a mold issue and have had my platypus filter for about three years now. After all that I store it up to use for my next trip. After doing all of this, I unscrew the filter and leave everything out to completely dry which can take anywhere from a few days to two weeks depending on the season. In addition I wash all of the hoses and water bags with warm soapy water for good measure. Prior to storing, I run a solution of 3-4 drops of bleach in a little over a liter of water, run that through the filter, let it sit for an hour, and then backflush it back through. Seymordunn- I have been worried about the same issue but have found that if you store the filters properly after a trip, you can prevent any issues that may arise. The bags make a nice source of additional water capacity if you need more water storage for a long days hike with few water sources. I love using it and had no trouble on any of my previous trips. I also use the GravityWorks filtration system. I have a Platypus GravityWorks and even bring it with me on solo trips. Gravity filters are so very, very worth it.
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