FT-AR-20X40

Filter sand 20 x 40

Name: Filter sand 20 x 40 – 0.42 to 0.84 mm
Brand: Harpon
SKU: FT-AR-20X40

0.42 to 0.84 mm

Filter sand for water: quartz and silica by grain size · view all (7)

20 x 40 quartz sand, 0.42 to 0.84 mm, the standard grading for the filter layer of rapid filters in water treatment plants. Washed, dried and screened, with 95 to 99% SiO₂ and a batch report with grading curve, effective size and uniformity coefficient.

Narrow grain range: clogs slowly and comes back clean after backwash
Hard quartz (Mohs 7): does not wear or turn to dust in use
No clay, organic matter or carbonates: adds no colour or hardness to the water
Batch report to check against the filter specification
25 kg bags, 1 t big bags or bulk, anywhere in Brazil

Price on request/ton

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Batch report with every delivery
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Specifications

Part number	FT-AR-20X40
Grading	0.42 to 0.84 mm
Sieves (mesh)	20 x 40 (ASTM/Tyler)
Typical effective size*	0.45 to 0.55 mm
Typical uniformity coefficient*	up to 1.6
Grain shape	Sub-rounded
Material	Natural quartz/silica sand, washed, dried and graded
SiO₂ content	95 a 99%
Specific gravity	≈ 2.65 g/cm³ (quartz)
Hardness	Mohs 7
Purity	No clay, organic matter or carbonates; no chemical additives
Use in the filter	Filter layer of rapid gravity filters (municipal and industrial plants), fine layer of dual-media filters under the anthracite, pressure filters for clarified water
Packaging	25 kg bags, 1 t big bags or bulk (m³)
Reference standard	ABNT NBR 11799 (filter media); AWWA B100 when the design requires
Report	Batch grading curve, with effective size and uniformity coefficient
Application	Water filtration

How to choose

Order the sand by the filter design: grading (range in mm or mesh), effective size and uniformity coefficient.
New bed: build from the bottom up, from coarsest to finest grain, levelling each layer before the next.
Before putting the filter into service, backwash until the water runs clear: it removes the fine dust from the charge.
Store the bags covered and on pallets: wet sand weighs more and cakes.

Other filter sand

FT-AR-8X20 · Filter sandCoarse filter sand 8 x 20 – 0.84 to 2.38 mm

On request Get a quote
FT-AR-0615 · Filter sandFilter sand 0.60 to 1.50 mm – big bag

On request Get a quote
FT-AR-12X20 · Filter sandFilter sand 12 x 20 – 0.84 to 1.68 mm

On request Get a quote
FT-AR-18X50 · Filter sandFilter sand 18 x 50 – 0.30 to 1.20 mm

On request Get a quote
FT-AR-4X8 · Filter sandQuartz filter grit 4 x 8 – 2.38 to 4.76 mm

On request Get a quote
FT-AR-18X35 · Filter sandSilica filter sand 18 x 35 – 0.50 to 1.00 mm

On request Get a quote

Frequently asked questions

Can it be used in a dual-media filter with anthracite?

Yes. It is the sand layer that sits under the anthracite. The anthracite comes separately, in the grading of the design, and being lighter it settles on top after backwash.

How many kilos go into one cubic metre of bed?

Between 1.5 and 1.6 tonnes of dry sand per m³ of bed*. Multiply the filter area by the layer depth and add 5% for losses in the first backwash.

Can't find the part?

Send us the part number, the machine brand or a photo of the part. We will locate it and quote.

Part not in the catalog

On requestFT-AR-20X40