Manganese sand must be able to be filtered　and washed in the filtration pond in a stable　and efficient manner　and must comply with the regulations of 1.1 main component, 1.2 quality (physical properties)　and 1.3 quality (leaching property).

1. Principal component　and quality

1.1 Main component
Manganese sand is obtained by adhering manganese dioxide on the surface of filtered sand for water supply,　and the main component of the adhering matter is manganese dioxide.

1.2 Quality (physical properties)
Quality (physical properties) shall be tested according to JWWA A 103-3: 2006-2 6.4.1　and 6.4.2　and shall comply with the provisions of Table 1.

1.3 Quality (exudability)
Quality (exudability) shall be tested according to JWWA A 103-3: 2006-2 6.5　and shall comply with the provisions of Table 1.

● Table 1-Quality

item		Quality regulations	Applicable test clause
Physical properties	density (g/cm3)	2.57 ～ 2.67	JWWA A 103-3:6.4.1
	Manganese adhesion (mg/g)	0.3　or more	JWWA A 103-3:6.4.2
Exudative	taste	Not abnormal	JWWA A 103-3:6.5
	Odor	Not abnormal
	Saturation (degree)	0.5　or less
	Turbidity (degree)	0.2　or less
	Iron　and its compounds (mg/L)	0.03　or less
	Manganese　and its compounds (mg/L)	0.005　or less

2. Dimensions
The dimensions shall be tested according to JWWA A 103-3: 2006-2 6.6.1　and comply with the provisions of Table 2　and the requirements set by the purchaser.

● Table 2-Dimensions

item	Dimensional regulation	Applicable test clause
Effective diameter (mm)	0.45 ～ 0.7	JWWA A 103-3: 6.6.1
Equal coefficient	1.7　or less
Maximum diameter (mm)	2.0　or less
Minimum diameter (mm)	0.3　or more

Quote: Japan Water Works Association Standard JWWA Water Supply Filter Material A-103: 2006-2
Revised on March 30, 2006