This used to be a great product a couple years ago; however, today I believe "One Star" is far too much. The directions read, "Rinse prior to use" and when you rinse, the sheath evaporates leaving you holding bits of charcoal. Additionally, it used to withstand a periodic rinse during use. You can't do that anymore, thus forcing you to put in another cartridge. It is just a cheap filter cartridge. I contacted Tetra via e-mail as stated on their box and they clearly state, "ALWAYS answered within 24 hours". I wrote them on 20Jun13 and they finally responded on 05Jul13. Are you kidding?? Therefore, I'm going to look at replacing my filter so I can buy a different, better made cartridge.
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