We have a pool and slide under construction. The stone steps to the pool slide have been made to be 12" steps. The stone guys did that without asking us but just looked at a good place for a stopping point and then calculated the steps and it worked out to 12". There is actually plenty of room to add in a couple more steps and our pool builder is fine with redoing it to have more steps so they aren't so high. My question is what is a good height for these type of steps? Is 9" still too high?