20 inch Big Blue Washable Filter

The 20 inch Big Blue Washable Filter sets up a pre-filter stage that can be used again and again on high-flow main lines.

The 20 inch Big Blue Washable Filter is used as the first stage on high-flow main water lines that carry a load of sand and sediment.

Housing Estate & Building InletsVillas & Detached HousesWell & Borehole Water LinesFactory & Workshop LinesHotels & AccommodationPre-Stage for Treatment UnitsIrrigation & Garden LinesSandy Spring Water

The 20 inch Big Blue Washable Filter works on the principle of mechanical filtration: water passes through a filtration surface and suspended particles are held on that surface. How sediment filters hold back suspended matter such as sand, silt, loose scale particles and clay, and why on their own they cannot remove dissolved substances, is explained in the University of Nebraska–Lincoln’s sediment filtration guide.

1. 1

   The Cartridge Is Seated in the Housing

   The cartridge is seated upright inside a 20 inch Big Blue filter housing connected in series on the main water line, and the housing is closed.

2. 2

   Water Passes Through the Cage to the Screen

   Water arriving from the inlet port fills the space around the cartridge, reaches the mesh screen through the gaps in the plastic cage and moves towards the centre.

3. 3

   Sediment Stays on the Screen

   Suspended particles such as sand, rust, silt and sediment are held on the outer surface of the screen; dirt that cannot pass through the screen collects around the cartridge.

4. 4

   Filtered Water Continues Down the Line

   Reaching the outlet port through the hollow centre of the cartridge, the water goes on to the plumbing or to the carbon, softening or reverse osmosis stages that follow.

5. 5

   Washed When Full

   When the flow weakens noticeably, the cartridge is taken out of the housing and washed with water without damaging the screen, and the same cartridge is fitted back in place.

When choosing the 20 inch Big Blue Washable Filter, the housing size, end cap design, flow rate and sediment load should be considered together.

The 20 inch Big Blue Washable Filter keeps performing well with regular, correct washing.

• Before the housing is opened, close the inlet valve, then open a tap to release the pressure inside the housing.
• Wash the cartridge under running water; running water through the central hole as well, to rinse the screen from the inside out, helps loosen sediment clinging to the surface.
• Do not use a stiff brush, a sharp tool or a very high-pressure water jet that could damage the screen.
• When the flow weakens noticeably, it is time to wash it; on sediment-laden sources such as well water, the washing interval is shorter.
• When refitting the cartridge, check the O-ring on the end cap and the O-ring of the housing cap, and once the housing is closed, check for leaks.
• Before the washed cartridge goes back into the housing, check the screen surface for any sand and silt left on it, and clean out particles stuck in the gaps of the cage.