This would perfect if you had a small backyard and small kids. You could keep it at 1'-3' for them and then lower it to 5'-6' for the adults. See website here. Plus, HOW FREAKIN' COOL?! See the video for a live action demo. It is said that the total cost is 20%-30% higher than that of a standard in-ground pool. That's a significant increase in cost but if your yard was too small for a larger pool with varying depths this could be your answer. You can even add a heater to make this an occasional spa. HOW COOL?!
Source: geekologie.com via Ashley on Pinterest