20'x40' inground vinyl lined 38-40,000 gal. 2 1/2 hp uprated 2 speed Aquapro APEX pump. 250lb sand filter rebuilt with commercial sized innards. 2nd owner of this pool possibly built in early 80's. Chlorine, baking soda, muriatic acid sometimes stabilizer and automatic puck filled inline chlorinator. 11/2 plumbing from pool 2 skimmers, 2 returns and a main drain. Recently replumbed pumping station with 2".