Quote:
Originally Posted by emc002
The only problem is you can't use it in turbid (cloudy) water.
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True that. Which is why the Katadyn is my preferred method. The pen is a fun toy, though, especially at night.
I forgot to mention that, as a supplementary tool, Sharpies are an integral part of a survival kit. In SHTF, it may become important to quickly differentiate "potable" from "NON-POTABLE!!!1!1!!" water containers. Some people likely can't or won't follow container-coloring standards, so you need to write down what's inside.