EWP-USA's empty refillable cartridge canisters are made of polypropylene and have pads/sponges on each side to filter sediment and to help protect media from leaving the canister.
These high quality cartridges are suitable for most types of media to improve taste, smell, pH adjustment and etc.
Standard diameters of 2.5" and 4.5"
Available in lengths of 10" and 20"
Available in white and clear
Carbon and resin are available to fill before shipping
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