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Concrete tilt slabs are created with internal copper piping that will be used to circulate glycol at 14 degrees below zero. The slabs (walls) are stood upright anywhere from vertical, to overhanging, or slightly sloped for easy angle. Bondor panels are put together to create a surrounding freezer, usually with a viewing window. Fans in the ceiling circulate air usually at -10 degrees C in the ice forming stage and then -4 degrees C when climbing. The glycol is turned on to circulate and chill the concrete, water is sprayed on as a thin film. Icemakers (like a vending machine but way bigger) produce chipped ice that is feed through a machine that grinds it up in a spinning motion (think of a turbo impellor), and blows it out a hose onto the wall, water is added in the mix after ejection to help it stick. Most walls are at least 10 metres high and the "snow" does not reach the top. Therefore instructors must put the wet snow mix in buckets and pack the snow by hand sitting hanging in bosen chairs (like window washers). After about 6 hours the snow hardens to ice (but not as hard as glacier ice). Once it is over 30cm thick it is ready to be climbed. Hand packing allows features to be added such as bumps and bulges etc. Blair Campbell, ex indoor ice climbing instructor www.hukawai.co.nz

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