Preserving micro or all-in-one fert solutions - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 01-21-2016, 08:32 PM Thread Starter
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Preserving micro or all-in-one fert solutions

I've had trouble in the past with spoilage of micro fertilizer solutions if not refrigerated. I recently saw an all-in-one fert recipe using potassium sorbate as a preservative/anti-microbial.
I also know that Excel can provide initial sterilization, but I'm guessing it would break down too quickly to provide long term protection against new contamination introduced when dosing.

What other solutions have people found to this problem?
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post #2 of 7 (permalink) Old 01-21-2016, 08:45 PM
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How do you contaminate during dosing?
I throw some excel or metricide in and never have any issues, I mix 1 month worth of fertz up at a time. If you mix a years worth it might be a problem. I also don't refrigerate it.

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post #3 of 7 (permalink) Old 01-21-2016, 09:07 PM Thread Starter
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I was thinking contamination would happen when opening the bottle and measuring out the desired amount. Maybe I shouldn't be using a pipette or syringe like I have been. I also assumed that mold spores could be airborne and enter the bottle when the lid is opened.

Maybe I should only mix a months worth at a time.
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post #4 of 7 (permalink) Old 01-21-2016, 10:11 PM
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I use a syringe, never any issues, just don't dunk it in the tanks and mix up smaller batches.
I mix up 800ml at a time in a 1 litre bottle. 790ml of RO water with 10ml of metricide.

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post #5 of 7 (permalink) Old 01-21-2016, 10:20 PM
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post #6 of 7 (permalink) Old 01-21-2016, 11:19 PM
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Ascorbic acid and potassium sorbate work well, as does excel/metricide. Vinegar also works.
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post #7 of 7 (permalink) Old 01-21-2016, 11:57 PM Thread Starter
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Quote:
Originally Posted by The Big Buddha View Post
I use a syringe, never any issues, just don't dunk it in the tanks and mix up smaller batches.
Sounds like I may just need to mix smaller batches and be more careful with my syringes then

Quote:
Originally Posted by shrimpNewbie View Post
Fridge =)
Yeah, I probably should. I tried it briefly and found I'm more likely to miss doses if I have to walk upstairs to the fridge, back down to the tank then back up to the fridge again.

Quote:
Originally Posted by nilocg View Post
Ascorbic acid and potassium sorbate work well, as does excel/metricide. Vinegar also works.
Thanks, I hadn't thought of vinegar.

I had assumed that Ascorbic Acid was used in micro fert solutions to lower the pH so that the EDTA Iron would stay in a stable state. Does the Ascorbic Acid have other preserving qualities?

Would using vinegar along with Excel be a good idea to both lower pH and sterilize?
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all-in-one, fertilizer storage, micro nutrients, preservative

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