I am guilty of spending about $20 every month for a Brita water-filter but here’s a cool hack that shows you that all you gotta do is replace the carbon crap inside it.
Why buy a replacement filter for $6 to $10 (or more) when you can refill your old filter cartridge housing for about 50 cents?!
Refilling is quick, easy and economical. If you can refill a salt shaker, then you should be able to refill a Brita, PuR, or other brand water pitcher cartridges. All that you will need is an old cartridge, some activated carbon, a polyethylene plug, a sharp utility knife or Xacto knife. A 1/2″ drill motor and 1/2″ drill bit are optional, but can aid in rounding out the hole.