The bottom of the filter sits against this one way valve, the water is pulled in from around the housing, into the inner pipe where it goes out the mouthpiece.
In the Brita water bottle, the housing has a "backwash" one way valve. Because of this we have a couple things that we need to do. It's the flowing from outside to in that filters the water. The filter has to have room around it to let the water coming in from the bladder to flow in through the charcoal into the inner pipe where it is sucked out through the tube. It has to be long enough for the filter to fit down fully. This is the length of the top part of the L connector AND the filter. Okay, first off you want to cut the black 1 1/4 inch pipe to length. Most of this is also force-fit rather than glued, but there are a few pieces that are glued down to make sure that there are no leaks. It took me about 5 hours to find everything, and I had to look in diverse places such as the irrigation systems for a sprinkler setup and the plumbing sets. It's gravity fed, and pressure serving (meaning that the weight of the water will send this out to your mouth, and you can suck out the rest). Plus, it holds more than a standard Camelback. Total cost was about $35 for this instructable, but it will filter water without having to do anything else. rubber repair tubing with pinch closure (on hand, can't find it in the store).1 1/4 sch 40 bushing with female 3/4 threads.Water Filters for Brita Drinking bottle (this is the hard-sided version).Okay here's a picture of the items I got to start this.
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