Only compatible age groups and size will use the BB Unit(s) at one time.
The maximum number of individuals of each group that should use the BB Unit(s) at one time are:

Unit Size Children 8 & Under Children 9-12 Older Teens
9' x 13'
6
3-4
2-3
13' x 13'
8
5-6
2-3
15' x 15'
10
6-8
5-6
16' x 16'
12
8-10
6-7