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In this process, so-called biogenic decalcification, carbonates are destroyed. As a consequence the carbonate hardness drops to dangerously low values and the pH-value becomes extremely unstable. However, with sufficient CO2 supply the plants utilize the carbon contained in the carbon dioxide.
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www.thekrib.com/Plants/Tech/golden-rules.html
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I understand the problem of biogenic decalcification can cause quite severe increases in pH. This is a problem in systems with high carbonate hardness where there is insufficient CO2 in solution.
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fins.actwin.com/aquatic-plants/month.9505/msg00170.html
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Subject: Re: Biogenic Decalcification ... On page 77, section 3.4.9, they lead into biogenic decalcification: "When the amount of free CO2 in water diminishes a process called biogenic decalcification begins. Through this process the plants cover their need for CO2 by taking their carbon from the bicarbonates.
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fins.actwin.com/aquatic-plants/month.9506/msg00008.html
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However, many plants (Cabomba, for example) are incapable of biogenic decalcification, and cannot reach their full potential without a supplemental source of carbon. Also, biogenic decalcification can cause a dramatic increase in pH, up to pH 9 or so - not very conducive to good plant growth!!
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www.yamatogreen.com/co2.htm
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Biogenic decalcification When there is a carbon dioxide deficiencey in the water, plants can derive CO2 from the hardening constituents of the carbonate hardness. First they split the hydrogen carbonates into CO2 and carbonates.
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www.aquabotanic.com/glossary.htm
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The light layers consist of diatom frustules and calcite crystals from epilimnetic biogenic decalcification in summer and early autumn. ...
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linkinghub.elsevier.com/retrieve/pii/S0009254105002238
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Your KH remains stable as long as the CO3 molecules aren't broken down, such as happens during Biogenic Decalcification, which will actually _raise_ the KH. Carbonate (CO3 2-)alone cannot be used for Biogenic Decalcification as it contains no Calcium, only Carbon and Oxygen.
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forum.simplydiscus.com/showthread.php?t=36155
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This reaction is called biogenic decalcification and effectively breaks down (removes) the bicarbonates dissolved in the aquarium water. ...
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drupal.cdas.org.au/content/do-it-your-self-carbon-dioxi...
drupal.cdas.org.au/content/do-it-your-self-carbon-dioxide-c02-and-other-bits-john-fleuren
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epilimnetic decalcification and, in sublittoral regions, biogenic benthic decalcification . ... Biogenic epilimnetic decalcification is best de- ...
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www.springerlink.com/index/VW2007813771X215.pdf
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