IG, pebble tech, 25K gallons, grotto, SPA that spills into pool, water slide, two other water falls. Equipment Pentair, filter FNS + 60, pool pump 1.5HP single speed wisperflo, spa 3 HP single speed wisperflo, grotto/ slide 3HP single speed wisperflo, waterfall 2HP single speed wisperflo, minimax NT 400K btu, Hayward XL pool vac, SWG IC60, compool 3800 automation, built 2007.