I've ordered my pool 15x48" metal frame pool and I was wondering if anyone would be willing to measure their pool and tell me how low the filter holes (in and out) are from the top of the pool. If I don't fill the pool all the way to the top do you think it will be loud/annoying if the return for the filter is above the water line? I want to keep the water level lower for the first couple of years because my kids are young. Thanks!!