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Fibreglass and Steel Dual Media Filters

Contact GR Solutions:
Tel: +27 [0] 31 266 9703
Fax: +27 [0] 31 266 9652

Cell: +27 [0] 82 652 1085

Postal Address:
P.O. BOX 703
Westville
3630

Email: garthe@mweb.co.za

Fibreglass Dual Media Filters and Steel Dual Media Filters

Fibreglass Dual Media Filters

Introduction
The GR6 and GR15 dual media filters utilise silica sand and hydroanthracite as filter media and are filters designed to provide effective filtration in a variety of applications including potable water treatment, swimming pool filtration and industrial effluent treatment

Materials of Manufacture

Component	Material
	GR6	GR15
Filter body	Moulded glass reinforced polyester / isophthalic resin	Moulded glass reinforced polyester / isophthalic resin
Filter lid	Moulded glass reinforced polyester / isophthalic resin	Moulded glass reinforced polyester / isophthalic resin
Underdrain	Polypropylene	Polypropylene
Control Valve/s	Either a plastic Hayward type multiport valve or 3 way valves	PVC or steel butterfly valves
Internal pipework	Class 16 uPVC	Class 16 uPVC
Nuts and bolts	Stainless Steel	Stainless Steel

Technical Specification

Item	Specification
	GR6	GR15
Filter diameter	700mm	1 250mm
Filter surface area	0.385m²	1.228m²
Filter media	400mm bed depth (6 x 40kg bags) of 0.5 to 0.7mm sand 400mm bed depth (3 x 40kg bags) of 0.9 to 1.5mm anthracite	400mm bed depth (6 x 40kg bags) of 0.5 to 0.7mm sand 400mm bed depth (3 x 40kg bags) of 0.9 to 1.5mm anthracite
Maximum operating pressure	250 kPa	150 kPa
Maximum operating temperature	45°C	45°C
Recommended filtration rates: - Potable water treatment - Swimming pools	Up to 16m/hour Up to 50m/hour	Up to 16m/hour Up to 50m/hour
Recommended backwash rate Underdrain details	30 to 50m/hour The underdrain is a radial arrangement of slotted polypropylene underdrains. The slots are tapered and are 0.3mm wide.	30 to 50m/hour The underdrain is a radial arrangement of slotted polypropylene underdrains. The slots are tapered and are 0.3mm wide.
Underdrain slot surface area	0.0135m²	0.0236m²
Vavle arrangement	The flow through the filter is controlled with a Hayward type multiport valve or with 3-way ball valves	The flow through the filter is controlled through a manifold of butterfly valves
Filter mass when empty	120kg	240kg
Filter mass when in operation	680kg	1 620kg
Filter footprint	An area of 1.5m x 1.5m should be allowed	An area of 2.5m x 2.5m should be allowed
Pipework sizes	The inlet, outlet and waste line conncections are 50mm PVC	The inlet, outlet and waste connections are 75mm PVC

Steel Dual Media Filters

Introduction

The GR25 and GR50 dual media utilise silica sand and hydroanthracite as filter media and are filters designed to provide effective filtration in a variety of applications including potable water treatment, swimming pool filtration and industrial effluent treatment.

Material of Manufacture

Component	Material
	GR 25	GR 50
Filter body	Copon coated mild steel (stainless steel on request)	Copon coated mild steel (stainless steel on request)
Filter nozzle plate	Copon coated mild steel	Copon coated mild steel
Nozzles	Polypropylene	Polypropylene
Control Valves	150mm butterfly valves	150mm butterfly valves
Internal pipework	Copon coated mild steel	Copon coated mild steel
Nuts and bolts	Galvanised mild steel	Galvanised mild steel

Technical Specifications

Item	Specification
	GR 25	GR 50
Filter diameter	1 800mm	2 200mm
Filter surface area	2.54m²	3.8m²
Filter media	400mm bed depth of 0.5 to 0.7mm sand 400mm bed depth of 0.9 to 1.5mm anthracite	400mm bed depth of 0.5 to 0.7mm sand 400mm bed depth of 0.9 to 1.5mm anthracite
Maximum operating pressure	400kPa	400kPa
Maximum operating temperature	45°C	45°C
Recommended Filtration rates: - Potable water treatment - Swimming pools	Up to 16m/hour Up to 50m/hour	Up to 16m/hour Up to 50m/hour
Recommended backwash rate	30 to 50m/hour. Air scouring recommended	30 to 50m/hour. Air scouring recommended
Nozzle details	The nozzles are arranged at 140mm centres in the nozzle plate. The tapered slots in the nozzles are 0.2mm wide.	The nozzles are arranged at 140mm centres in the nozzle plate. The tapered slots in the nozzles are 0.2mm wide.
Valve arrangement	The flow through the filter is controlled through a manifold of butterfly valves	The flow through the filter is controlled through a manifold of butterfly valves
Filter mass when empty	1 800kg	2 750kg
Filter mass when in operation	6 400kg	10 000kg
Filter Footprint	An area of 3m x 4m x 3.5m high should be allowed	An area of 3.5m x 4.5m x 3.5m high should be allowed
Pipework sizes	The inlet and outlet connections are 100mm Table D flanges. The air scour inlet is a 50mm BSP female threaded socket.	The inlet and outlet connections are 150mm Table D flanges. The air scour inlet is a 50mm BSP female threaded socket.