what tubing to use in a radiant slab?

about to pour a basement slab, but wanting to add radiant tubing to be connected at some future date? wondering what type of tubing to use. i have heard regular pex is not to be used in concrete and the aluminum coated pex is super expensive. whats the low down?
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Pex for potable water should not be used. Pex with an oxygen barrier made specifically for radiant heat should be used.
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the orange stuff. Can't remember what it's called right now. it's a bit thicker. Google 'radiant slab' for many many hits.
http://www.radiantcompany.com /
http://www.radiantcompany.com/details/grade.shtml
s

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I hope you insulate under the slab, use foamboard.
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