The working life of the shower filter depends on the brand and your usage. So always know your consumption and needs before opting for any filter. Keep in mind the following things to make sure that you get the right one:nFor normal home uses to go for the one that filters 10 000 gallons of Water.nWhen talking about consumption, the people in your house also matters. In the end, if the filter is used frequently, you will have to replace the filter cartridge regularly.nSimilarly, the amount of mineral content in your Water also affects the lifespan of the filter cartridge.