The Everpure QL1 can accommodate a wide range of cartridges. Be sure to use only '2' and '4' size cartridges with this head.
An example of a '2' size is the OCS, H54 and any cartridge with the number 2 in the description.
An example of a '4' size is the BH, H104 and any cartridge with the number 4 in the description.
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Here is a link to learn more about warranty & returns.