Moe, The head loss calculator @ RC has both calculations available for the mak 4 & mak 5 pumps. Just put in the height it's being pushed along with any 90 / 45 or 30 degree elbows that are inline. Normally a 90 elbow will take out a foot of head preasure. If you use the calculator you can pretty much get it down very close. Hope this helps you & get movin will ya!!