I am wanting to go from my current ring pool to a Ultra Frame Pool this year. I have 3 boys ages 4 to 7. My latest ring pool was a 15'x30", which was a depth of about 24" or so. My concern is the depth of the water so that the pool is safe for my children. I wanted to get a pool that will last a few years and was looking at an 18'x48" Ultra Frame Pool. I called Intex to check the water depth for this pool and was told that the depth would be 42". With the ring pools I would fill the pool about 90% or so which kept the depth of the water a little more shallower, can you do the same with the Ultra Frame Pools or do you have to fill the pool up to the 42" depth? I don't know how deep the inlet and outlet for the pumps are and was hoping someone who has this type of pool could help me.