Hey, I think this should help you

http://www.icmag.com/ic/showthread.php?t=23357
Michael J Cox Reviewed by Michael J Cox on . Nitrite levels 12 (mg/L) is this okay??? i was checking my hydro bucket tonight since changing the n. solution (about 3 days ago) where i left it at ph 5.3 alkakinity (kH) 20ppm hardness (GH) 19ppm nitrite .01 (mg/L) nitrate (NO3) 25 (mg/L) and today when i looked at it before turning the lights off it was Rating: 5