Shelf Life of Mixed Glutaraldehyde - The Planted Tank Forum
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post #1 of 4 (permalink) Old 11-18-2014, 06:30 PM Thread Starter
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Shelf Life of Mixed Glutaraldehyde

Hi Everyone,
I have been reading a lot about dosing with Excel. But the cost for Seachem Excel is too much for my size tank (110 gal). Does anyone have experience with mixing glutaraldehyde? I can not go the pressurized CO2 since I would have to travel 75-80 miles to fill a CO2 tank.
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post #2 of 4 (permalink) Old 11-18-2014, 06:58 PM
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Salut, tu es du Québec?

I use glutaraldehyde double dose, because it cost 50$ to refill a 10lbs cylinder in Quebec city. I would have to go to Laval to have a cheap CO2.

Results with glutaraldehyde are fair but cannot be compared to CO2, some plants seem to like it more than others. I have a 65G planted tank.

Hygrophila polypserma is thriving, so do the cryptocorynes but they were slow to adapt at first. Bacopa is good but not brillant, however it could be light related. Ludwigia is growing but not red, not in it's full magnificence.

Michel, but it's better than no C at all.

Plants and algae grower.
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post #3 of 4 (permalink) Old 11-18-2014, 06:59 PM
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Hi PMaj,

Seachem Excel and glutaraldehyde have "a very long shelf life" and according to Seachem their Excel product has no expiration date.

That said, for the last five years I have purchased concentrated glutaraldehyde (50%). I store it in our downstairs refrigerator (proper marked of course) and bottles I have kept for well over 2 years have not lost any potency. If a fridge is not available, a cool, dark spot in your home should work just as well.

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75 Gallon, 2X55W AH Supply CF 8800K, 1X 59W Fluval Plant (3.0); 45 Gallon Tall, 1X 46W Fluval Plant (3.0); 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 & (Calcined) Montmorillonite Clay
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post #4 of 4 (permalink) Old 11-18-2014, 09:19 PM
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Originally Posted by micheljq View Post
Salut, tu es du Québec?
Interesting, I never knew there was a Fremont in Quebec Canada... I took it to be Fremont California (USA).

Regardless, I have no experience with glut mixing, but I have read that the shelf life of mixed glutaraldehyde depends on what you mix it with for dilution. The pH of the resulting mix has a large impact on shelf life.
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