We are soooo new to this process and could use some help choosing what equipment we need! Our pool will have a 7' spa, slide and 3 deck jets. It is about a 40' long, 20 wide free-form. Our pool designer says we should get one variable-speed pump. Our rebar and plumbing guy says we should do 3 pumps. Any thoughts and info you have would be greatly appreciated! Thank you!!