almostthere
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putting on my hiking shoes....
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Post by almostthere on Aug 3, 2016 6:43:22 GMT -8
I'm a kookoo and still use a First Need. First needs are not light, but provide the most comprehensive purification. Especially if you are dealing with agricultural runoff. You do realize there are things that First Need still does not do? There are some chemicals and minerals that only reverse osmosis will remove.
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rebeccad
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Writing like a maniac
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Post by rebeccad on Aug 3, 2016 8:38:33 GMT -8
I recall using Zeke's gravity filter a couple of years ago. He just dropped the end of the clean hose into the water bag and let it drip in. You do have to be more careful not to knock things over that way, of course. That's not the threads I'm talking about. The Sawyer mini itself screws onto the dirty bag and needs a tight seal so you can squeeze the bag and push the water through. Sawyer bags last about as long as Saran Wrap. Evernew bags are wonderful but HARD TO FIND. I've ordered twice recently and had them cancel the order for lack of stock. Ah, I get it. Thanks for clarifying. That would be an important connection. Zeke's set-up had hoses going both ways, which makes sense to me.
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reuben
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Gonna need more Camels at the next refugio...
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Post by reuben on Aug 3, 2016 8:47:53 GMT -8
The Sawyer mini itself screws onto the dirty bag and needs a tight seal so you can squeeze the bag and push the water through. Maybe I'm just not in as much of a hurry as you are, but I let gravity do the work. No need to squeeze.
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BigLoad
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Pancakes!
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Post by BigLoad on Aug 3, 2016 10:11:52 GMT -8
Evernew bags are wonderful but HARD TO FIND. I've ordered twice recently and had them cancel the order for lack of stock. I've seen them with some regularity at Summit Hut in Tucson. BPL used to sell them, but I don't know if they still do. I stopped looking after they seemed typically out of stock and sometimes not even listed.
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reuben
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Gonna need more Camels at the next refugio...
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Post by reuben on Aug 3, 2016 10:27:03 GMT -8
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Post by johntpenca on Aug 3, 2016 14:08:38 GMT -8
You do realize there are things that First Need still does not do? There are some chemicals and minerals that only reverse osmosis will remove Yeah, agreed. I have been in the H20 profession for 30 years as a mechanical engineer. In my opinion the activated carbon in the first need removes most chemicals. RO is not the ultimate. We usually treat RO permeate with some sort of oxidizer. Short of using ion exchange resin, the first need is the most comprehensive filter. edit: when considering treating your water, it is important to consider the source of the water. by and large if you aren't dealing with agricultural/mine run off, simple filters are fine.
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bigDdeed
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Go big or go home
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Post by bigDdeed on Aug 4, 2016 15:05:51 GMT -8
johntp great info!
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amaruq
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Call me Little Spoon
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Post by amaruq on Aug 5, 2016 6:41:53 GMT -8
I'm looking at the gravity filter kits, which are kind of pricey, but as far as I can tell, all I really need is the filter unit and some tubing and I can create my own gravity filter set-up. Platy bags are cheap, and I have lots of tubing around. Am I missing something? Or can I just buy, say, the Sawyer Mini replacement filter and take it from there? I have the 2L Platypus Gravityworks kit. I looked into buying the components separately and then piecing together a working gravity filter from them. But would you believe the cost of buying the separate components came out to the cost of the kit (+/- $2). Much like Reuben, I simply set it up and let it do it's thing. The 2L doesn't take too long, just remember the higher you hang/hold/set the dirty bag, the faster it flows. I'm not sure what threads are being discussed, the Platy has barbs for the hose on both ends of the filter, a barb leading to various end attachments on the clean end, and a barb to a quick release on the dirty end.
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Deleted
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Post by Deleted on Aug 6, 2016 7:30:05 GMT -8
We bought, this year, a Sawyer mini, to cut off a few ounces. We use the Sawyer Squeeze and mini in a gravity filter configuration. Our bladders have the Sawyer quick connect attachments. After filling a squeeze bag, we attach the filter to the squeeze bag, and quick connect the bladder to the filter. We place the filter, squeeze bag higher then the bladder, give the squeeze bag a push, to get things started, and then do something else whiles the bladder fills.
We have been using such a set-up for four or five years without an issue; works well, till it doesn't.
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