Citric acid based.https://www.aquariumgardens.co.uk/dennerle---carbo-elixier-bio-nano-100ml-2510-p.asp
It’s says it’s based on all natural ingredients? So maybe not glutaraldehyde.
Wish we had the formula, Citric Acid is cheap enough.
Are there any organic compounds (i.e. sources of carbon) that aquatic plants can absorb in sufficient quantity to sustain them - other than glutaraldehyde?
I've just realized that we're not only talking organic compounds. Inorganic compounds/ions could also supply carbon and they do, e.g. bicarbonate (HCO3-).
I’ll hazard a guess that it’s a brown liquid and if it is then likely to be Humic and Fulvic acids which are pretty good chelating long carbon chain molecules most easily uptaken by plants...
Citric acid based
Thank Darrel for this summary article
also known as the Krebs cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions in the cell that breaks down food molecules into carbon dioxide, water, and energy. In plants and animals (eukaryotes), these reactions take place in the matrix of the mitochondria of the cell as part of cellular respiration.
My guess would be that the majority of them are using the CO2 until you get well above pH7.In fact, at pH = 6.5, the DIC* mix of CO2 and HCO3- is approx. 50:50. Do plants absorb each of these equally?
My guess would be that the majority of them are using the CO2 until you get well above pH7.