When you are getting quotes for pool construction make sure you are comparing apples to apples. Block is fine for smaller dipping pools, but if you are building a larger pool, at the beach, rock is better.
Rock is also more labor-intensive. As you can see in the first photo, block has parallel lines of mortar which can create a place for the pool to fail over time, especially with large volumes of water and its pressure.
- Pool being built with block
Rock on the other hand is non linear and is structurally stronger as it is not hollow. Notice on the rock-constructed pool below how the rebar reinforces the wall, which is not common in a block pool. So if you have a small dipping pool on a solid surface like in Merida, block is fine. If you are building on sand at the beach, block may be an issue in the future.
- Pool being built with rebar and rock
Not all pools or pool construction quotes are apples to apples, so read the specifications carefully.
Aerocretos de Mexico 
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