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I did mine with the cheaper PVC flexible liner, but if I did it again I'd probably use copper.
For the flexible liner I did a sloped mortar bed, liner and then another layer of sloped mortar. The tough part about the liner is folding it into the corners, it's not hard, but unless you shave your studs back a bit the rock can tail out at the bottom. That being said it's not really noticeable on mine.
For the tile I used a mortar specified for under water use...I think it was Versa Bond?
-spence
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