How much Metricide to add to Micro bottle? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 10-06-2020, 03:29 PM Thread Starter
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How much Metricide to add to Micro bottle?

I知 setting up an auto-doser, so I知 planning on mixing my dry ferts with distilled water and having it under my tank. I知 worried about mold in the micros, so I値l add some Metricide 14 to help with that. How much Metricide should I add to make sure there is no algae / mold in the dosing containers?

I致e been rethinking this, and is there anything wrong with just mixing my liquid ferts with the correct ratio of Glut already added? Here痴 my math, so folks can double check me

- My 125G tank is going to have roughly 80G of water in it after hardscape
- Using NiloCG DiY liquid ferts, the recommendation is 5mL / 20G of water, or 20mL
- NiloCG DiY liquid ferts is 1 packet of ferts / 500mL of RODI water
- I知 planning on doubling the amount of RODI water, and doubling the dose. This should help make the dose more consistent by increasing the total amount of solution dosed every day. Daily dose of 50% ferts would be 40mL / day
- The correct dose for Metricide 14 is roughly .75mL / 10G, or 6mL / 80G.
- If the total dose is 40mL daily, then the liquid mix for 1000mL of solution should be 150mL of Metricide 14 and 850mL of DI water

Does all this math make sense to everyone else? Will 15% Metricide be enough to prevent mold and algae in my dosing containers and tubing? Is there any chemistry reason not to add this much Metricide to the Macro and Micro mixes (precipitation, etc)?

Last edited by jellopuddinpop; 10-06-2020 at 06:02 PM. Reason: Change of plans
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post #2 of 4 (permalink) Old 10-06-2020, 06:10 PM
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Metricide 14 is 2.6% Glutaraldehyde. Excel is 1.5% Glut
Excel/Matricide = 1.5/2.6 = 0.58

By ratio, the equivalent dosage is as follows:

Initial after WC(2ppm): Excel 5ml/10gal = Metricide 2.9ml/10gal
Daily afterward(0.4ppm): Excel 5ml/50gal = Metricide 2.9ml/50gal
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post #3 of 4 (permalink) Old 10-06-2020, 06:33 PM
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10ml excel/vinegar to 500ml ferts to prevent mold.
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post #4 of 4 (permalink) Old 10-06-2020, 07:19 PM
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Some members do you use glut as a preservative. I use food preservatives as an alternate, as do many others. My concerns with the glut (Metricide or Excel) is that it may destabilize over time. It is certainly sensitive to light and will lose it's killing power when exposed to light. It also may react with any organics (if they appear) in the solution. If using it, I would suggest keeping pH below 5 and this is where the vinegar recommendation, above, can help. There isn't much evidence, either way, for my concerns, so you may be fine using it.

If you're interested in the alternative approach, use ascorbic acid (antioxidant): 1 mg / 1 ml, and potassium sorbate (mold inhibitor): 2 mg / 5 ml.
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