h a l f b a k e r yExpensive, difficult, slightly dangerous, not particularly effective... I'm on a roll.
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Good idea. Unfortunately, I think it's baked, isn't it? |
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I can't be bothered to google it, but it is baked, sorta: the systems use water rather than air. You need quite an impressive length of tubing under the ground at a depth of (if I recall) a couple of feet at least. But it works and is commercially available. I nearly bought one. |
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