The SiltStopper is a mandatory feature for saving your filter cartridge and preventing endless back flushes. If you are anywhere that has even mildly turbid water this will be indispensable. I have a virus filter (for when I'm in South America and Asia) that silt would clog in a heartbeat and then I would have to disassemble and back flush then get another couple hundred mLs and back flush again,
This review was written in the old system and had content requirements that are different than reviews written today.