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Hydration system: Difference between revisions
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** Because the hose attaches to the bottom of the bladder, in order to let the last of the liquid into the hose, air that reaches the opening bubbles to the top of the bladder, and is trapped there until the liquid is nearly drained. Each time more air is blown into the bladder than the amount of liquid that was just drunk, the pressure inside the bladder increases, and the more effort blowing back involves. Therefore the technique profits from enough attention to develop a sense of when the hose is nearly full of air. | ** Because the hose attaches to the bottom of the bladder, in order to let the last of the liquid into the hose, air that reaches the opening bubbles to the top of the bladder, and is trapped there until the liquid is nearly drained. Each time more air is blown into the bladder than the amount of liquid that was just drunk, the pressure inside the bladder increases, and the more effort blowing back involves. Therefore the technique profits from enough attention to develop a sense of when the hose is nearly full of air. | ||
* Depending on the size of the opening for filling the bladder, it may be convenient to include, in hot weather, [[ice cubes]] or crushed ice when filling it. In theory too much ice means running out of liquid water while the bladder still has ice occupying space that could have been filled by more water (so it helps to take account of how temperature and humidity affect the balance between consumption rate and melting rate), but it helps that most people's tendency seems to be to put in less ice than would last through the hike. | * Depending on the size of the opening for filling the bladder, it may be convenient to include, in hot weather, [[ice cubes]] or crushed ice when filling it. In theory too much ice means running out of liquid water while the bladder still has ice occupying space that could have been filled by more water (so it helps to take account of how temperature and humidity affect the balance between consumption rate and melting rate), but it helps that most people's tendency seems to be to put in less ice than would last through the hike. | ||
* The use of liquids that provide [[calories]] (usually in combination with [[flavoring]] and perhaps [[rehydration]] salts) increases the cleaning burden by nourishing bacteria, and if the user neglects to empty and rinse the bladder, judging the cleanliness of the bladder at a later date involves more effort than with containers that are more | * The use of liquids that provide [[calories]] (usually in combination with [[flavoring]] and perhaps [[rehydration]] salts) increases the cleaning burden by nourishing bacteria, and if the user neglects to empty and rinse the bladder, judging the cleanliness of the bladder at a later date involves more effort than with containers that are more transparent and in some cases more accessible. Some users carry plain water, with or without ice, in a bladder, but drink something else from [[Nalgene]]-style bottles during rests. | ||
* On trips over a day, or in especially hot conditions, need for more water than is carried my require [[Water purification|purification]] of local water. | * On trips over a day, or in especially hot conditions, need for more water than is carried my require [[Water purification|purification]] of local water. | ||
** Attention to mechanical compatibility of a filtration system with the bladder, or with a Nalgene-style bottle that may be carried to fill the bladder, can be worthwhile. | ** Attention to mechanical compatibility of a filtration system with the bladder, or with a Nalgene-style bottle that may be carried to fill the bladder, can be worthwhile. | ||
