Empty Refillable Filter Cartridge for 10" Standard Housing

As far as I can find it's the only game in town for refillable media cartridge (there are other sellers but the product looks to be the same thing). It works, but it it is very flimsy plastic and the way the bottom screws on makes a very poor seal, not to mention barely holding on to the threads. Pick it up with the bottom down and you risk dumping carbon all over the place if the cap falls off. That being said it should work OK once you get it into a filter, but there is no way to really know how well the top seals in the filter to force water through the media instead of just going in and out.

these work very well

Was a little thinner than what I have purchased in the past.