Quote:
Originally posted by sabalough
a properly functioning dsb converts nitrates into nitrogen gas it dose not store them.
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So that would mean that a failed DSB or improperly functioning dsb could be leaching nitrates back into the system because it cannot convert them.... thus creating a nutrient trap. He only has a 2-3 inch sand bed not deep enough imo to be a true functioning dsb. I don't want to start a dsb thread either but the fact is that sand beds can and do fail and leach nutrients/nitrates back into the system.
Like I said in the other posts I would test test and test every source of water, rodi, newly mixed salt, etc... and see what you find. Get yourself a salifert test kit.
Just trying to help the guy out and point him in a direction he might not have been looking.