I am in the process of working with a builder on my pool design. It will be a pool only (no spa), but I am building a grotto water fall. The grotto will be roughly 8 feet wide and 3.5 feet off the water. I am building a free form pool roughly 33' x 20'. The builder is telling me that I will only need 1 variable speed Jandy pump vs. having a separate water feature pump? Does this sound correct? They are telling me I could add an additional pump but it will just cost more money and is not really needed. Should I get the additional water pump or not?