Ahhhh …the scare tactics showing the horrors of using a product that kills germs in hospitals in our tanks!! If we inject just a little potassium into our blood, we get almost instant heart attack, yet we pour it, with abandon, into our tanks …OMG!!!
This is a comment upon the referenced website:
Most that have used glut report substantially enhanced plant growth for all but a few species of plants (which can be adapted to it), in contradiction to the author’s finding. He goes on to state that “a dosage of 1 ml per 50 l water daily the plant will show clear signs of damage.” Taking into account the differences between his 5% solution and Metricide’s 2.6% solution, he is saying that damage occurs at .15 ml / gallon of water. This is far below Seachem’s recommendation and I have, personally, routinely used 2 ml /gal of Metricide with no damage. I found it to be particularly effective at improving growth in low-tech setups at Seachem’s recommended dosing levels. This can be easily tested by adding it, withdrawing it and repeating this over and over while watching growth rates change, for the better, every time is resumed.
Regarding it being called a CO2 supplement, he is right and it is unfortunate that so many people seem to call it such. None of the suppliers of this for aquariums do. It is a carbon supplement, not a CO2 supplement and is only similar to CO2 in that they both contain carbon, it is also related to my firewood in the same way. The carbon contribution of glut is far below CO2 but, in the sense that more is better than none, that extra carbon does enhance growth vs. relying only on atmospheric CO2.
Yes: glut has been classified as dangerous, just as about every product known to man has been determined to be “known” to cause evil things according to California and the EU. Treat it with respect and no problem. Also, I would not advise ingesting large quantities of any of our macro nutrients daily.