I have a water filtration system that uses activated coconut shell carbon as its media. The filter is listed as being able to purify up to 50 gallons, but I won't be using it for anywhere near that amount in any one use.
How long is the filter usable after initial use? If I use it to purify a couple of gallons one weekend, then don't need it for a couple weeks, or maybe even a month, will it still be usable? Or will it need to be replaced? Is there anything I can/should do to preserve it between uses (e.g. dry it back out somehow)?