Photo courtesy Jim Messina

1 Demographics.Who will use the structure? Young children or teens? Knowing the answer to that question will help you decide which type is right for you.

2 Location.Do you want the structure in a zero-depth spray area or a shallow-water pool area? Both have pros and cons.

3 Capacity.Some experts say the pool or wet deck should be twice the size of the structure.

4 Quality.Demand quality finishes and materials. Stainless steel piping resists corrosion, as do baked on finishes.