Does carbon bleach your corals ? (Kent carbon recall)

[Borderjumper]

Feb 22, 2012

RE: KENT Marine Reef Carbon Product Advisory

There is a quality concern with KENT Marine Reef Carbon manufactured between December 5th of 2011 and February 8th of 2012. The concern is that the batch of carbon contained unusually high levels of heavy metals which have an adverse effect on stony corals and clams in marine settings. KENT Marine Reef Carbon is a virgin coal based carbon that is mined giving it greater adsorption properties. Unfortunately during this mining process, small layers containing heavy metals like copper were introduced into the carbon. This contamination of heavy metals would likely go undetected in freshwater environments and would not affect livestock. However in marine (salt water) aquariums, the effects can be seen in as quickly as a couple of hours to stony corals and clams. Fish and higher invertebrates such as shrimp do not seem to be affected. After removal of the contaminated carbon and dilution by a water change or use of other filtration means, most corals have been able to recover in 2-3 weeks from the exposure.

This carbon is also mainly used for commercial potable and wastewater treatment such as municipal water supplies. These are single pass systems where the water will only pass through the carbon bed once and any residual leaching of metal into the water will be minimal. This is also why carbon is not typically tested for heavy metals; until now. When carbon is used in aquarium settings, the water passes through the carbon bed multiple times increasing the soluble metal in that enclosed environment.

If you have purchased KENT Marine Reef Carbon in the last three months, please refer to the below table to identify the product size you may have purchased and the expiration dates affected.

00027 - KENT Marine Reef Carbon 1lb (1qt)
************ EX20DEC14* EX21DEC14* EX22DEC14* EX25JAN15 00031 - KENT Marine Reef Carbon 15lbs (5gal)
******** *** EX05JAN15** EX17JAN15** EX18JAN15
00028 - KENT Marine Reef Carbon 1.9lb (2qt)
************ EX05DEC14** EX08DEC14** EX13DEC14* 00032 - KENT Marine Reef Carbon 25lbs
********** * EX21DEC14
00029 - KENT Marine Reef Carbon 4.1lbs (1gal)
************ EX18JAN15** 00681 - KENT Marine Reef Carbon 44lbs
************ EX02FEB15** EX08FEB15
00030 - KENT Marine Reef Carbon 7lbs (2gal)
************ EX13DEC14 * EX14DEC14** EX03FEB15 *
These expiration dates can be found imprinted on the product label or stamped on the product bottom.

If you have product with an above expiration date, please discontinue use and perform a standard water change. Take the remaining product back to the retailer where it was purchased for a refund or exchange or call a Central Aquatics customer service representative at 1-888-255-4527.

We apologize for the inconvenience this has caused as we want to assure you that we intend to deliver the highest quality products possible. With this development, the quality of KENT Reef Carbon will be produced under new testing protocols.

Again we sincerely apologize for having to bring this quality concern to your attention. If you have any questions about this advisory or any other KENT Marine product, please contact a Central Aquatics customer service representative at 1-888-255-4527.


Best regards,

Scott Rabe
Central Aquatics
Brand Manager Food & Water Care