Quote:
Originally posted by drummereef
Ewww. That's not good. Thanks for the heads up, Hop. I might get started on that sooner than later then. Do you really think the 'explosion' of phosphate was only from the rock? Were there any changes to your system that might have caused this buildup? 
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I have also heard that the Marco Rock is high in PO4, probably silicates as well. I would run it in a tub of water with GFO for a week or two.