You mean, another cartridge, right?
Be sure to get a Unicel or Filbur cartridge -- probably NOT available at your local store -- and avoid the Chinese made "replaces Unicel" or "replaces Filbur" cartridges. If you'll post your EXACT filter make/model, I'll see if I can find the right one on Amazon.
Here's the cartridge cleaning guide: http://pool9.net/cart-clean/
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