The Best Backyard Swimming Pools

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Apparently you should replace your pool lining every five years. This coming May it will be 4 years since we bought our place and the pool lining certainly wasn't new when we bought the house.  The lining is starting to pull away from the edge and there's a patched hole above the waterline on one side. It looks like we'll need to do something about it this winter.

We could do a straight out replacement, but then it will only last 5 years (or 10 like this one has) so it just might be better to do something else instead of replacing the lining. Tiling is one possibility. I think Nick would like the pool to be lined in tiny mosaic tiles. As nice as that would look, it would cost a fortune to have a tiler carry out the work. We are probably leaning more toward having the pool sprayed in concrete. Much cheaper. It could then have tiles around the top edge, but I do like the smooth concrete look of the pools below.

Which pool is your favourite? I'm divided between the cactus one below and the concrete one at the very end. The mosaic feature in the one below is pretty cool, maybe we could do something like that? What are your thoughts? And isn't the round pool just so cute?! If we didn't already have a pool, I'd want one of them!
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cacti pool via georgia design
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aqua via picnics caron
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round pool via apartment therapy
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concrete pool via the outdoor co.operative