Re: NANFA-L-- Precipitate

Todd D. Crail (tcrail-in-UTNet.UToledo.Edu)
Wed, 25 Jan 2006 09:11:21 -0500

Thanks all for your replies...

Hmmm... I wonder if it was scavenging hydrogen from the fats instead. Those
may be weaker bonds to a carbon in the fat than to the oxygen in water? I
never saw a decrease in pH, so something is buffering it.

I'm not kidding about it being "smokey". Looks like you opened Jeff
Spicoli's van door lol.

Whatever its doing, it sounds like my charges got lucky. It just never ends
in aquaria, does it? :)


----- Original Message -----
From: "Nick Zarlinga" <>
To: <>
Sent: Wednesday, January 25, 2006 8:18 AM
Subject: RE: NANFA-L-- Precipitate

> Todd, keep a close eye on your system. Using too much dechlor does have
> drastic consequenses. What happens is the Sodium Thiosulfate ions react
> with excess hydrogen ions (lower pH systems or low pH pockets-like in your
> deep sand bed- are very much-in-risk) to form elemental sulfur and sulfate
> gas. (The precipitate is sulfer) The reaction is usually self
> because more sulfate gas reacts with water to form more nasties which
> sulfuric acid which lowers pH and scavenges oxygen until all the sodium
> thiosulfate or all the oxygen is gone from the system. You may have just
> been lucky enough to have all your thiosulfate scavenged before your O2
> deplete or your pH tanked. It is documented in numerous cases and is
> commonly called "white death". I think we touched upon this a couple of
> years ago but the thread quickly died-err- ended.
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