I actually just purchased my first gravity filter two nights ago. It is currently en route. I am excited to get it and use it just because I know I am going to smile so wide when I am filtering water as I sit in my chair watching everyone else pump theres....hahahaha!

I purchased a Seychelle Gravity filter system for cheap...as seen here.

http://www.gofastandlight.com/Gravity-Power-Water-Filter-and-Purification-Basecamp-Bag/productinfo/W%2DS%2DGRAVBAG/

Wish I had seen these instructions though, could have saved myself even more cash at relatively the same weight. Great job! Thank you for sharing.
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"To me, hammocking is relaxing, laying, swaying. A steady slow morphine drip without the risk of renal failure." - Dale Gribbel