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Co² tabs for water feeding

izzy89
izzy89started grow question a year ago
Do you have experience with CO² tabs? This manufacturer says 1 tab is enough for 100L (=26 gal). The particles attach to the water and uptake is through the roots. They said overdosing is not possible but should be cautious with PH of the water, also after adding fertilizers.
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Feeding. Other
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GrowCN
GrowCNanswered grow question a year ago
CO2 in water forms carbonic acid which will lower pH. Also, any gas dissolved in water will try to reach equilibrium with the surrounding air (Henry's Law). So, even if there is some free CO2 in the water... it won't be there for long. Do not waste your money on that product. The only economical viable way I have seen to introduce CO2 is with bottled or liquid gas which has it's own expenses and is not suitable for a small grow. Yes, you can buy a cylinder of CO2 from any welding or gas supplier but in small quantities it is expensive. If done on an industrial scale however CO2 is affordable. I suppose if you grow inside a brewery or distillery where fermentation is done continuously you could make it work. Home use fermentation bags are largely useless. They only produce a small amount of CO2 and only happens for a short period of time when fermentation is active.
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Mining_green
Mining_greenanswered grow question a year ago
Cool
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ernest_twwg
ernest_twwganswered grow question a year ago
You only need to add extra CO2 during extreme heat and light intensity. That's literally it. Just being in your tent for 5 minutes a day adds enough CO2 for the next 24 hours, at least. Don't buy into the CO2 nonsense unless you actually need it for the reasons I mentioned. It will just be a waste of money.
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Sciolistic_Steve
Sciolistic_Steveanswered grow question a year ago
don't take my clear disgust personally.. this is 100% aimed at the snake oil saleman that is whoever made that product and marketed in some bullshit way.
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Sciolistic_Steve
Sciolistic_Steveanswered grow question a year ago
https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_Biology_(Kimball)/16%3A_The_Anatomy_and_Physiology_of_Plants/16.02%3A_Plant_Physiology/16.2D%3A_Gas_Exchange_in_Plants
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Sciolistic_Steve
Sciolistic_Steveanswered grow question a year ago
sugar / yeast --- realize it takes 30lbs of sugar to power the yeast for 10-12 weeks. You can do the math to calculate how much you need to be running all the time relative to volume of space it is filling to reach 1200-1300ppm of CO2... if you add co2, you should be certain it's reaching those levels... otherwise who knows how much oyu are actually helping it it becomes more about internal feelings than reality. i'm not going to do the math on the chemical reaction.. but you can look this up.. it'll be in molar ratios. can convert to ate of co2 released and with volume of space you can determine how many grams of sugar and amount of yeast needed to produce and maintain that level of co2 over time... otherwise it's a lot of effort with reduced return.
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Sciolistic_Steve
Sciolistic_Steveanswered grow question a year ago
i guarantee the plant does not take in Carbon through its roots... not the function of the roots. Adding co2 will probably make your water more acidic than it was before (not a maybe, actually.. it will and nothing to do with the fertilizers added... those have their own impact on pH... if the excess co2 can react with your fertilizers due to higher concentrations, that's just another potential negative ramfication... you don't want unknown chemical reactions taking place, obviously) This is some "bro science" by people that don't know what they are doing and never took a science class in their lives beyond some introductory course, if that. plants get their co2 from stomata opening to allow gas exchange. there is necessary anatomy present that is not present in roots to make use of said co2... co2 in you irrigation water won't do shit. Thank you... this is by far one of the most entertaining products i've seen in a while... when gasses are dissolved in wate, they are not "attached to teh molecules" ... they are in solution... water has a carrying capacity... gasses reach equilibrium with envionment VERY fast... almost immediately... so you drop those co2 tabs in and it may temporarily boost co2, but it is quicly leaving solution to reach equilibium with sorounding atmosphere.... if yo don't water almost immediately, i doubt the co2 levels are even much higher than normal, lol... within a short time it'll leave solution. This is not a good product.. this manufacturer is either ignorant or deceitful.
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izzy89
izzy89answered grow question a year ago
adding more info; I thought CO² was absorbed by the leaves at first but apparently that is not the whole story... They also said I could use it as a foliar spray but it is used mainly with watering. They say waterfeed the plants once or twice a week with this untill the last two weeks before harvest. I'm also thinking about DIY CO² system (air feeding) with a carboy, dry yeast and sugar. I don't know which one would be more effective as I have a grow tent of 4'x8' Water feeding with tabs or air feeding with a carboy... :-) thank you in advance for your response !
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