... side mount c)OEM d)simplify installation NL series non-poisonous sand water filter swimming pools >> ... option>>Technical Characteristics NL SERIESNL1200, 1.11 sq meter(filter area), 3’’/90mm(valve connections) 55. ... rate) 2900kg(sand) NL2000, 2.97 sq meter(filter area), 6’’/160mm(valve connections) 147 cbm ... rate) 4000kg(sand) NL2300, 4.43 sq meter(filter area), 8’’/200mm(valve connections) 219 cbm ...