Hi KayDee:
I cannot imagine needing the sand if you have a Happy Bottom. I believe, if you get a really smooth, polished finish on the concrete, you many not even need the Happy Bottom--depending on the pool--but I would guess it's a good idea to have one anyway. I know that with Splash pools you probably don't need one, and with EasySet donuts, their tarp is sufficient protection.
The pool cove at the bottom goes on top of the sand--or happy bottom. If you don't use the cove, then traditionally, the cove was built of sand.
hope this helps.
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