In ground 18 x 36 with 6.5 foot deep end , according to online calculation should be 24,000 gallons. Pool builder puts in a 1.5 HP hayward super pump with almost every pool. My pump with hayward cartridge Swim clear 3030 filter will be approx 60 feet from my skimmers and floor drains(which should be separate) in the deep end and only 20-30 feet away from the various returns. Do I measure the total head from the skimmers or returns? If from the Skimmers than it seems that the regular Super pump maybe just making it and possibly the better choice will be the hayward Super II as it is better suited for longer lengths. Please help out with this calculation and giving advice between the regular Super pump and the Super II ( HP ?-) Thanks Much !