Nitraguard

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I am using nitraguard for some time.
Recently i find the nitraguard turn dark green and slimy . Can i still use or should i throw it away.

Thanks
 
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Hoe are you running it? Reactor or bomb method?
When i first used it, i ran it in a fluidised reactor. Also had it do green then black slimy solid mat of goo around and in between cubes...
But it just kept on sucking NO3 out the water.
Upload a pic of what it looks like
 
I put in a bag near my skimmer output. It was put there for a year and no problem. Only recently refill become dark and slimy. Nitrate has increase from 5ppm to 7ppm. Sps health seems to be declining. Lost a few colonies. try to upload photo from hp but dont seem have a function here to do that
 
2017-02-15 23.22.36.png
 
How's your airpump?
Looks to me like not enough flow so bacteria has died. almost the same as what happens in a sand bed
 
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