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Old 01-30-2009, 05:45 PM   #141 (permalink)
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Default Re: glutaraldehyde instead of excel



Here is what happens to Glutaraldehyde after its added to water.

that picture is from DOW cheimcals.

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Old 01-30-2009, 06:09 PM   #142 (permalink)
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Default Re: glutaraldehyde instead of excel

I don't think that happens very quickly, since gluteraldehyde is diluted with water. If all of it turned into CO2 then the solution wouldn't be active for 28 days like it says on their bottle since it would all be CO2.

I think that is only one of the reactions that takes place with gluteraldehyde when it is added to water. But in the presence of other chemicals like KNO3 or NH3/NH4, I would bet that it can react to form different products. Perhaps gluteraldehyde is providing several nutrients to the plants at the same time. What do you think?
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Old 01-30-2009, 06:26 PM   #143 (permalink)
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Default Re: glutaraldehyde instead of excel

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Originally Posted by Zapins View Post
I don't think that happens very quickly, since gluteraldehyde is diluted with water. If all of it turned into CO2 then the solution wouldn't be active for 28 days like it says on their bottle since it would all be CO2.

I think that is only one of the reactions that takes place with gluteraldehyde when it is added to water. But in the presence of other chemicals like KNO3 or NH3/NH4, I would bet that it can react to form different products. Perhaps gluteraldehyde is providing several nutrients to the plants at the same time. What do you think?
Here is what i could find http://www.dow.com/PublishedLiteratu...romPage=GetDoc
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Old 01-30-2009, 08:51 PM   #144 (permalink)
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Default Re: glutaraldehyde instead of excel

This caught my eye because I have a tank that has just started devouring KNO3. I have been fighting a green threadlike algae, so I dose twice the recommended Excel. It is also lightly stocked (I think) and I recently let a small chain sword totally take over; I had assumed that those were the causes. Of course, this was with Excel. I am almost out and just received my Cidex 3.4% yesterday, getting up the nerve to try it out. The poster above said that Excel did not have this effect in tests, only glutaraldehyde did. Does that mean I could need to add even more KNO3? yikes.
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Old 01-30-2009, 09:05 PM   #145 (permalink)
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Default Re: glutaraldehyde instead of excel

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This is an absolutely fascinating observation and seems to support my suspicions!

The way plants incorporate nitrogen into their tissues is by using an enzyme called glutamine synthase to make glutamine in the following reaction:
(NH4+) + Glutamic acid ----glutamine synthase ---> glutamine

Glutamic acid looks like this:

and glutamine looks like this:

Gluteraldehyde (excel) looks like this:


Just look at the similarity between gluteraldehyde and glutamic acid and glutamine! The drop in nitrates makes total sense because the plant must be using gluteraldehyde as a backbone for adding nitrogen to. This is probably why the nitrate levels in the water drop after adding gluteraldehyde, because the plant can absorb more nitrogen without having to waste energy making the backbone for it.

I wonder if instead of being a CO2 substitute, is gluteraldehyde really just helping the plants absorb nitrogen faster (and therefore helping them grow faster)? After all, if it was providing CO2 then it would drive photosynthesis faster and produce pearling, and I have never seen plants pearl after adding excel, nothing like adding CO2 and seeing pearling.
How about this. Glut provides carbon dioxide which increases plant growth. Increased plant growth means increased nitrogen uptake and less nitrogen in the water, right?
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Old 04-06-2009, 11:26 PM   #146 (permalink)
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Default Re: glutaraldehyde instead of excel

Well its been 2 years since this thread has first started. So conclusivley now can we say that it is just as effective as excel? Has there been any bad experiences with it so far?

Where can we get the 50 percent solituions now? How much should we dose after all?
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Old 04-07-2009, 05:58 AM   #147 (permalink)
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Default Re: glutaraldehyde instead of excel

Hi MartialTheory,

I have been using Glut instead of Excel for about 6 months now and I find it works as good as Excel both as a source for carbon and as a algae inhibitor. I buy mine here: http://www.emsdiasum.com/microscopy/...raldehyde.aspx. See post #114 on page 12 of this thread for information as to price and more importantly, hazmat and shipping costs. BTW, Excel contains 1.5% glutaraldehyde.
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Old 04-07-2009, 08:19 AM   #148 (permalink)
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Default Re: glutaraldehyde instead of excel

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Hi MartialTheory,

I have been using Glut instead of Excel for about 6 months now and I find it works as good as Excel both as a source for carbon and as a algae inhibitor. I buy mine here: http://www.emsdiasum.com/microscopy/...raldehyde.aspx. See post #114 on page 12 of this thread for information as to price and more importantly, hazmat and shipping costs. BTW, Excel contains 1.5% glutaraldehyde.

Thanks im about to get it then.

But how about the beginin about 2.5 percent? That didn't seem harmful?

How is ODing working for u when u use it to combat algae? Do ur plants die as well? How about shrimps and fishes?

I have been told it is more harmful.
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Old 04-07-2009, 06:27 PM   #149 (permalink)
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Default Re: glutaraldehyde instead of excel

Hi MartialTheory,

I mix is at 1.5% concentration. Some of my tanks get "normal" dosage per Excel instructions; other tanks get 2X dosage if I have an outbreak of algae starting.

I don't have any problems with my plants at 2X dosage except for my Vals (but not Sags). My Vallisneria grow 24" tall without Excel / Glut and 2"-3" tall with it. They still send out runners and look healthy except for being stunted. Who knows, this may be a way to develop a new "dwarf Val"! LOL Instead of Vals I use tall (18") Eleocharis species (Giant Hairgrass).
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Old 04-07-2009, 09:26 PM   #150 (permalink)
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Default Re: glutaraldehyde instead of excel

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Thanks!!!
Anyone have any experience using glutaraldehyde in a tank with Subwassertang.
Subwassertang would melt if you dose 3times the recommended amount. It happened to my plant.
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