Praga Filament-Wound Sand Filter – Public Pools

Praga filament-wound filters are made of isophthalic polyester and fibreglass and come with a pressure gauge, air purge and water drain valve. A Ø 400 mm filter lid and 2½" sand drain plug are standard; the filter bed height is 1 m.

The filters suit filtration rates of 20, 30, 40 and 50 m³/h/m²; the flow rate equals the filtration area multiplied by the chosen rate (for example Ø 1600 mm: 2.01 m² × 30 ≈ 60 m³/h). Each diameter and rate has separate order codes for 2.5 bar and 4 bar maximum working pressure; connection sizes range from 63 to 160 mm.

The standard distribution is a collector-arm system; a nozzle plate system is available as an option. A side manhole is recommended on nozzle plate filters for easy media removal. The valve collector system is sold separately; the filter code excludes filter media and the valve collector.