It seems like the carbon was leaching just enough to mess with your water quality and not crash it.. Prolly because of the large water volume.

I wouldn't chance it.. Dump it .

ya you're probly right. will do :biggrin:

I doubt that if you bought it so long ago that it is contaminated with copper because i lot of people were using it then and there was no report of copper poisoning until recently. Just test a batch running in loop in a bucket and see if that water contain copper after 12 hours and you'll know.

We should be carefull not to point every possible crash on Kent carbon, as there might be other causes. The only way to be sure is to do a test and let a cup of carbon run into a bucket and then test for copper. If there is no copper than the carbon is NOT contaminated.

I didn't say it was a crash. Nothing in my tank died, it just went downhill and I had some cyano issues. I don't have a copper test kit. When I find one I'll do the test but for now all I can do is suggest that perhaps Kent was the problem. Who knows, perhaps it wasn't copper but something else?

Hey christy. We have a salifert copper kit I use at the store. Your welcome to use it anytime. If you go by and I'm not there just get them to give me a call.

Thanks Chandler! I'll probably take you up on that sometime :biggrin: