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Black gravel

You might request manufacturer information & then contact for details re composition (looks like the coated type which means no CEC etc)
 
Its goods stuff not coated, used it some time ago from this seller - only problem is that is magnetic/iron rich, sticks to magnetic algae cleaner...
 
Its goods stuff not coated, used it some time ago from this seller - only problem is that is magnetic/iron rich, sticks to magnetic algae cleaner...
Hi, what sort of problems could this cause.
Cheers
 
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