Product review (2 stars): Katadyn Pocket
The good:

1. Compact
2. Very well made

The bad:

1. The manual says that if you pump the filter "dry" horizontally it will not be harmed by freezing. This was not the case and the filter element broke into a thousand pieces. The filter was never dropped or abused and was always pumped dry. Even so after freezing it broke into a thousand pieces so the freezing IS an issue.

Summery

Do not believe the manuals claim that freezing will not harm it if it is pumped "dry". If you live in a freezing climate like I do this filter MUST be disassembled and dried out or you just might find it broken one morning. My suggestion is do not use this filter if you encounter freezing weather allot or if you don't want to completely dry out the element during freezing. Don't trust the manual's claim that it "will not be harmed by freezing temperatures..."