Hi Anthony, We do not recommend using any type of circulating pump, as that is a dangerous, unapproved electrical device, and can cause additional hazards and potential injury. Also, there is no sump built into the inflatable to isolate water for circulation. Inflatable water parks are not designed to hold in water, but to minimize water use, please see our article on minimizing water use. http://blastzone.com/shop/pc/Minimize-Water-d50.htm Thanks!