15K gallon in-ground gunite/plaster pool(58 year-old Anthony Bros.), 15'x30', depth 3-1/2'->8' . Hayward Ecostar pump. Hayward DE-3600 filter with Variflow 710XR50 1-1/2" valve. Polaris 380 cleaner & "the pool cleaner (suction)". Main-drain suction disconnected. New skimmer suction plumbing 2" PVC. Single return line 1" copper. Cleaner line 1-1/2" copper, re-plumbed in pump-house (PVC) for either suction or pressure. Hayward 3/4HP PB4 booster pump. Leslie's 260 BTU Coppertherm heater. All new suction interconnect plumbing 2". Return plumbing, filter-to-booster, 1-1/2". Single return to pool 1". All equipment located 2-1/2ft. above pool bottom level ( neg. 5ft. from surface ).