Request: Add Magnesium Oxide (MgO) to Nutrient Dosing Calculator

urbanbard

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Dec 16, 2022
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Hi all! I'm glad to have an account now. I've been using your calculator for a while. Thanks! MgO is a component of many Aqua Rebell and Dennerle fertilizers among others. Any reason it's not already in the calculator?
 

Allwissend

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If you want to convert from MgO to Mg , just multiply by 0.6.

Can't say much about the calculator, but MgO is a reporting standard/requirement for fertilizers. Just like K2O and P2O5. It's not that the fertilizers have the substances, or you actually add these molecules to the aquarium, but for historical reasons legislation got stuck demanding this format to report the concentrations of Mg ( and K and PO4).

As the calculator is meant primarily for hobbyists to make their own solution or figure out how much nutrients premade fertilizers add, it makes no sense to use legacy reporting standard.
 
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urbanbard

New Member
Dec 16, 2022
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3
Berlin, Germany
If you want to convert from MgO to Mg , just multiply by 0.6.

Can't say much about the calculator, but MgO is a reporting standard/requirement for fertilizers. Just like K2O and P2O5. It's not that the fertilizers have the substances, or you actually add these molecules to the aquarium, but for historical reasons legislation got stuck demanding this format to report the concentrations of Mg ( and K and PO4).

As the calculator is meant primarily for hobbyists to make their own solution or figure out how much nutrients premade fertilizers add, it makes no sense to use legacy reporting standard.
Good to know. Thank you for this!
 
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Allwissend

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maybe also add an Mg/Ca GH calculator?
Welcome to the forum! The calculator will offer the increase in GH (in °dH) for compounds containing Ca or Mg. This is useful when remineralizing RO water for example and targeting specific Ca and Mg levels.
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Allwissend

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Thanks for clarifying your request. What Mg test do you use? I find the JBL offers rather poor color differentiation above 3.