... b).side mount c)OEM d)simplify installation NL series non-poisonous sand water filter swimming pools ... and manhole are available in option>>Technical Characteristics NL SERIESNL1200, 1.11 sq meter(filter area), ... cbm/h(flow rate) 1350kg(sand)NL1600, 2.06 sq meter(filter area), 4’’/110mm(valve connections) ... water temperature 43 degree>>Pictures NL series non-poisonous sand water filter swimming pools ...