No really; I’ve have never see listed any filtering system that does not have a gallon usage listed. even a Berkey recommends 3000 gallons per filter and my Katadyn Hiker has a 200 gallon reconmendation.
Sure, hand pumps have filter life spans, fairly long ones, too, but you can have lots of them and they do not go bad sitting on a shelf.
Also, 200 gallons is a lot of water for a small $40 filter that can sit on a shelf forever. Larger sized filters with electric/hand pumps can go 300,000 gallons, but cost $1,200.
Chlorine lasts 12 months if kept in 70 degree storage. Chlorine can also be abused and make people sick; unlikely for most people but it does happen. Transport of Chlorine is risky as spillages can be costly to the destruction of other preps.
Again, anything even remotely difficult to get, keep, or use is not in my preps. Anything with a limited shelf life like Chlorine is also discounted. On the go, filters allow immediate driking water. At home, filters allow large quantities of water using a safe and reliable means through filtration.
Berky filters can be cleaned and reused almost indefinitely. If you pre-filter the junk out they’ll also last much longer.