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  1. Keesje

    UV-C to prevent Bud rot and mildew

    I looked for YouTube videos about it, but couldn't find any. Perhaps guys like @Randomblame can shine a light on it.
  2. Keesje

    UV-C to prevent Bud rot and mildew

    There are some devicces for sale that claim that they help to prevent bud rot and mildew amongst others. You hang the device in your room and it will kill the spores. This is such a device: They are also placed in hospitals, kitchens, bakery's, dentist, etc. to help prevent bacteria and...
  3. Keesje

    The Chinese Quantum Board Knock Off Builds

    @Stone_Free It is nicer for us, if you write your reply outside the quote box.
  4. Keesje

    Control odor & sterilize your room air + surfaces 24/7 + eliminate PM

    In my opinion, no substantiated evidence has yet been found for this. Research is being done, but as far as I can tell, there is no definitive outcome yet. If you type it in google you will also mainly end up on cannabis-related sites.
  5. Keesje

    Control odor & sterilize your room air + surfaces 24/7 + eliminate PM

    I think once you have mildew or botrytis ozone and trioxide can't do much anymore. As I understand they only kill the spores.
  6. Keesje

    Control odor & sterilize your room air + surfaces 24/7 + eliminate PM

    To find out if it really works for bud rot and mildew, you should actually do some comparative tests in controlled environments. You should therefore test whether it performs better or worse than devices that work with ozone only. I did read some of their reports, but those didn't seem like...
  7. Keesje

    Control odor & sterilize your room air + surfaces 24/7 + eliminate PM

    How will you make sure that all the air goes inside this tiny device? I am also wondering what is inside the device. They claim that they have a patent on it, but can't find it anywhere. Sceptical as I am, I do think it is just an ozonmachine and nothing else. There are several devices on the...
  8. Keesje

    Co2 usage 2x 16kw 25x25 625 sqft rooms? 50lb bottles/tanks

    Ah, I thought that you could not have larger amounts of gas (in a truck for example) delivered to your spot. I understood it wrong. Sorry about that. Hope someone comes up with an answer. But for us who can choose between a 20 lbs tank of Butane/Propane and a 20 lbs tank of CO2, the...
  9. Keesje

    Co2 usage 2x 16kw 25x25 625 sqft rooms? 50lb bottles/tanks

    As I said before: I have no clue. However, on a different (non-english) forum I found a statement by a well known grower who is an expert on growing with CO2 and AC. He wrote: "You forget that if you burn 30 kg of gas, for example, you get a larger amount of CO2 than if you get 30 kg of cold...
  10. Keesje

    Co2 usage 2x 16kw 25x25 625 sqft rooms? 50lb bottles/tanks

    Interesting numbers! How long was your run? What is the ppm you are aiming at? How do you build up the ppm during your grow? Do you only run it with lights on? Is your room totally sealed, or do you have some exhaust?
  11. Keesje

    Co2 usage 2x 16kw 25x25 625 sqft rooms? 50lb bottles/tanks

    I can't do the math, but what would produce more CO2? A 50lb of CO2 or a 50lb bottle of Propane? My guess would be the bottle of CO2 because it is 100% pure, but I have no clue. What would be cheaper?
  12. Keesje

    Co2 usage 2x 16kw 25x25 625 sqft rooms? 50lb bottles/tanks

    True. I do know greenhouses that don't use generators, but they get their CO2 almost for free from some industry where it is a waste product.
  13. Keesje

    Question: Sealed CO2 room

    Before I wrote that this is not possible, but I have to review that. I mixed up a few things. Ergo: You are right!
  14. Keesje

    Hand held UV light as a preventitive to mold?

    But first it will hit the leaves. What is the moment that it will not work anymore?
  15. Keesje

    Question: Sealed CO2 room

    Dissolved Oxygen is an irrelevant factor in a system like Aeroponics with sprayers. The main reason plants need O2 is because it is used for turning glucoses into energy. I think it is called 'respiration' in English.
  16. Keesje

    Question: Sealed CO2 room

    No, that's not true. For sure the plants produce oxygen but not enough for them. That would be a Perpetual Motion and as in physics it is also impossible in biology. @futuretech No need to change a thing. Do not inject O2 in your water or whatever solutions people come up with. Although your...
  17. Keesje

    Hand held UV light as a preventitive to mold?

    It is only 4 or 5 days, right? Perhaps a little early to see any difference. So you see any bleaching of the leaves?
  18. Keesje

    Hand held UV light as a preventitive to mold?

    I am really curious about the results of this device. The use of UV-C for preventing diseases is still controversial. There are - as I know - no scientific papers that state that it works. But perhaps it does in some circumstances. Keep us posted!
  19. Keesje

    Anyone growing in perlite? Results?

    The pH down of GH is also based on Phosphoric Acid, as it shows on page 2 of this Safety Data Sheet And Advanced Nutrients ph Down as well. As far as I know all (or almost all) pH Down products in bottles for the bloom stage are P2O5.
  20. Keesje

    Anyone growing in perlite? Results?

    @cobshopgrow and @TintEastwood You guys seem to know a lot about all these ingredients. Now I have a question and perhaps you guys can help me out. It is about P2O5. In all fertilizers P is always named as P2O5 on the label. There are several other names for this: Phosphoricanhydride and...
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