NIHON GENRYO
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SWS


MST



Filter Sand

Filter Sand-1
Filter Sand-2
E.S. 0.6mm, U.C. <1.2 E.S. 0.6mm, U.C. <1.7
More than WO of drinking water in Japan passes through filter sand of
Nihon Genryo.
In terms of sand filtration (rapid/slow filtration), the maintenance of filters largely depends on the property and particle size of filter sand, so the selection of quality of filter sand is very important.
The best choice of filter sand is of good property, of the size that is appropriate for the filtration method, of high quality and in conformity to leaching tests. Filter sand collected from natural sand accounts for 10% of that used for rapid filtration and 30% of that used for slow filtration. For uniform particle sizes, an advanced technique for sieving sand is necessary. We use experience of more than 60 years and cutting-edge technology to produce our products, and conduct sieving tests as well as physical and chemical tests based on strict company standards to provide high-quality filter sand.

Standards for selection under JWWA A-POR and results of our filter sand tests (extract)

JWWA A POR
Quality regulations

JWWA A POR: QOOU test results
Production area (example) Takahagi Plant
(our plant)
Turbidity RO degree or below PO degree
Specific gravity Q.TV-Q.UV Q.US
Ignition loss O.VT or below O.SO
Attrition rate R.O or below O.SO
Hydrochloric acid solubility R.T or below O.RO
Uniformity coefficient P.V or below P.R or below is achievable


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