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[APD] Re: Fertilizer Stability
I've just switched from dosing KNO3 as a stock solution to dosing dry. I had a bit of stock left (~13% w/v) so I tested it for ammonia. Read ~3ppm. Also tested 1:10 dilution and got no reading. Since I was diluting this about 1:20,000 in my aquarium, I don't think a little bit of ammonia would've hurt. Just FYI.
> Just browsing through the archives and noticed this post:
> >> What about KNO3? I keep this in a clear bottle. Will KNO3 degrade in > >> this
> >> environment? Even on other tanks where I store it under the stand it
> >> eventually grows a little _fuzzy_ stuff.
> > It's stable, as well as the vast majority of the salts we use. It's just
> > the chelated stuff that degrades so easy. I wouldn't worry about the
> > fuzzy stuff. It's probably bacteria, or excess KNO3 falling out of
> > solution. A 30% solution is pretty close to the saturation point. If it
> > bothers you, make smaller volumes of solutions or weaker
> > concentrations.
> I notice a bit of this stuff in my KNO3 stock solution (~13%) too after > time. I think that it's biological; bacteria/fungi? rather > thanprecipitation. I'm shortly going to switch to dosing dry.
> I've never been too worried about it, but my question is, could some of > the nitrate be reduced to ammonium during storage by bacteria/fungi? Would > redox be low enough? If so, then might this not promote algal growth? Just > curious.
> Clint Brearley
> Melbourne, Australia
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