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    • CommentAuthordelprado
    • CommentTimeApr 19th 2017
     
    I currently have the philips one from "loan" on amazon. Its interesting. Air smells cleaner. Once running the PMC count does go down after a while. Filter looks like the real deal since it looks akin to a proper asbestos one in a dust extractor I once used.

    Anyone used one, have any thoughts on these generally?
    • CommentAuthorlineweight
    • CommentTimeApr 19th 2017
     
    My thoughts: you have to ventilate anyway, to deal with CO2 and humidity. So might as well deal with other air quality issues as part of that system, instead of a separate one. Also, how does it perform once people inevitably don't change the filters?
    • CommentAuthorMackers
    • CommentTimeApr 19th 2017
     
    Why not use plants?
    • CommentAuthorlineweight
    • CommentTimeApr 20th 2017
     
    I don't think there's much evidence that plants really make a significant difference, is there?
    •  
      CommentAuthorfostertom
    • CommentTimeApr 20th 2017
     
    Why wouldn't they, considering they consume our bodily wastes (CO2 and H2O vapour) and we thrive on their unwanted wastes (O2)?
    • CommentAuthorlineweight
    • CommentTimeApr 21st 2017 edited
     
    http://www.buildingecology.com/articles/critical-review-how-well-do-house-plants-perform-as-indoor-air-cleaners/

    http://www.gardenmyths.com/garden-myth-born-plants-dont-purify-air/

    I don't claim to be an expert, but when I've looked into it before I've come to the conclusion that there's no good evidence that they provide a significant effect.

    Happy to have my mind changed though.
    •  
      CommentAuthorfostertom
    • CommentTimeApr 21st 2017 edited
     
    How d'you mean 'mind changed'? looks like the 2 reports actually support
    Posted By: lineweightI don't think there's much evidence that plants really make a significant difference

    But is this thread about VOCs (the subject of these reports) or CO2, H2O?

    The 'gardenmyths' report seems to suggest that it's the root-zone soil not the plants that were doing the filtering in the original NASA study. For a start tho, how can there be 'root-zone soil' without there being roots hence plants?

    Mentioned elsewhere was microbes in the soil. Not mentioned at all, and poss key to the whole question, is the micorrizal (fungal) networks that by definition are present in any soil with growing plants - the fungals are what breaks down soil, captures nutrients and delivers them into the root fibres.

    Sounds like a possible basis for 'something' seeing VOCs as valuable raw material and breaking them down. Otherwise we're left with the question - what does a plant do with an ever increasding burden of VOCs that it's 'filtered' from the air?

    Note that planbting tres in urban streets is supposed to 'purify the air' - but again, are we talking VOCs, or CO2/H2O?
    •  
      CommentAuthorSteamyTea
    • CommentTimeApr 23rd 2017
     
    Posted By: fostertomHow d'you mean 'mind changed'? looks like the 2 reports actually support
    I think lineweight means better studies that shows that house plants (not carbon filters or soil bacteria) actualy purify air.
    Those two articles highlight the failings of the initial report (the NASA one) while still not supporting the myth.
    • CommentAuthorlineweight
    • CommentTimeApr 23rd 2017 edited
     
    Seems there are plausible mechanisms for it to happen - just not good enough evidence to show it actually does to a significant enough degree, or which can tell us how much foliage you'd need per volume of air.
    • CommentAuthorMackers
    • CommentTimeApr 23rd 2017
     
    I agree there is insufficient evidence. This shouldnt put you off using plants though. For years the medicinal properties of plants has been known. Lavendar can help reduce stress and anxiety and jasmine can promote healthy sleep. Do some research into plants that produce oxygen at night for bedrooms. Moss art can be used also to add to the aesthetics.
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