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Thread: Crushed glass?

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    marcus_r's Avatar
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    Crushed glass?

    Greetings.

    One occasionally sees (recycled) crushed glass for sandblasting (to be used instead of, well, sand).
    Has anybody tried this instead of sand for growing carnivores?

    Cheers,
    Marcus

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    Hello, I must be going... Not a Number's Avatar
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    I seem to recall bluemax was using recycled bottle glass. Glass is just silica even though it has added compounds for color. Even so it should be inert enough to be safe.
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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    corky's Avatar
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    FredG has had a go , be careful as some seems to have a lot of crud mixed in Recycled Glass Paving Sand - B&Q | CARNIVOROUS PLANTS & FRIENDS

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    Chemically it should be fine, but if the particle size itself isn't fine, then it might be pointy on the roots, which would make the plant not fine.

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    I Am the Terror Of the Night! NemJones's Avatar
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    The only thing i can think that would make it unsafe is sharp shards or additives in the glass.
    Green bottles contain iron for sure.

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    Lotsa blue bluemax's Avatar
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    I used recycled glass pool filter sand and I recommend it, but I can't vouch for other products. Even so it is good to rinse it, and this is not hard to do being as it is quite clean in appearance and relatively coarse. I can't say what, if any, effect the sharpness of the grains has on plants but I haven't seen any, at least that I can identify. Perhaps jostling together in a bag is enough to grind off any really sharp edges.

    Nice that Fred did some research and listed the results on the paving sand - and too bad it comes with so much unwanted material in it. I do like the low price. I pay around $20US for 50 lbs of the pool filter stuff. It lasts me for at least a year at my rate of use.
    - Mark

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    nimbulan's Avatar
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    I got some of the glass filter sand on bluemax's recommendation since I couldn't find any silica sand around here. It's not cheap, but I haven't had any problems with it. It's worn enough that there are no sharp edges - I haven't cut myself mixing soil bare-handed - so I doubt it could harm the plants any more than regular silica sand could.

    I have noticed that this particular brand Vitroclean seems like it needs rinsing. The water becomes quite cloudy when rinsing. I don't know if it's just air bubbles from blasting the sand with the hose or if there's actually some sort of contaminants. Contaminants being present would be a bit strange though considering it's supposed to be used for cleaning pool water.

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    marcus_r's Avatar
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    Thanks, everybody, for your input—and corky for the link!

    Happy New Year!
    Last edited by marcus_r; 01-01-2016 at 03:22 AM. Reason: corrected typos

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