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Impurities within the water

Harmfull Substances to human health and countermeasures



Dangers to the human body


Escherichia coli bacterium Not to be detected Bacteria can cause orally-transmitting digestive system disease Boiling sterilization, chlorine sterilization
Arsenicum 0.01mg
/l or below
Atrophy of hair or nails, cirrhosis, perceptual disorder Treatment by desalination equipment, not using the water for drinking water, researching the cause and changing the source of water supply
Hexavalent chrome 0.05mg
/l or below
Severe vomiting and diarrhea, kidney problem
Nitrate-nitrogen or
/l or below
When infants (6 months old or younger) drink brine, the infant can develop methemoglobin thrombus or respiratory disturbances Treatment by desalination equipments, changing source of water supply, and using the water for purposes other than drinking water
Manganese 0.05mg
/l or below
Symptoms of poisoning, mainly neurological symptoms (speech disorder) Water is colored and dishes become stained. (Problem caused by manganese-containing water) Installing manganese removal equipments, changing source of water supply
Chloride 200mg
/l or below
Although the criteria are set to begin when people taste saltiness, the total amount taken including those taken from food is important rather than the density of the substance contained in water. Use raw water desalination plants for when the chloride is 2000 ppm or below. Use seawater desalination plant for when the chloride is 2000 ppm or higher
(total hardnesses)
/l or below
When highly-concentrated, a person may develop gastrointestinal problems. When using extremely hard water it is difficult to create bubbles from soap, and has many other impacts upon our daily lives. Not suitable for use as boiler water. Water of adequate hardness (10100 mg/l) can be tasty when used for drinking water. Treatment by water softening plant or desalination plant
pH value
(hydrogen-ion concentration)
5.8〜8.6 This figure shows whether the water is neutral, alkaline, or acid. It is ideal to have a pH value for drinking water around neutral (pH value 7). Acidic water will make water supply facilities corrode.  


All the ion substances listed below existent in the water will be removed,
and the treated water will become pure and high quality water

NoItem Removal rate(%) NoItem Removal rate(%) NoItemRemoval rate(%)
1Chloride 99.6 14 Mercury 9497 27 Sulfide 9698
2Sodium 99.6 15 Radioactivity 9397 28 Isopropanol 8590
3Calcium 99.8 16 Ammonium 8090 29 Acidum lacticum 9499
4Magnesium 99.8 17 Bromide 9095 30 Glucose 9698
5Potassium 99.4 18 Phosphate 9697 31 Sucrose 9799
6Manganese 99.8 19 Cyanide 8595 32 BOD 9596
7Iron 99.8 20 Silicate 9698 33 COD 9294
8Aluminum 9698 21 Silicic anhydride 8090 34 Trichloroethylene 8397
9Copper 9698 22 Nitrate salt 9095 35 Arsenic 9398
10Nickel 9698 23 Boron 7080 36 Nitrate-nitrogen 9698
11 Cadmium 9397 24 Fluoride 99.6 37 Nitrite-nitrogen 7090
12Silver 9396 25 Chromate 8595 38 Pesticide chemical 9199
13Zinc 9698 26 Lead 9598

How to select Desalination Equipments

The purpose and the volume of water used by number of people

Purpose and the volume of water used

1 person (1day)

50 people (1day)

100 people (1day)

500 people (1day)

1,000 people (1day)

2,000 people (1day)

Only for drinking3L/day0.15t0.3t1.5t3.0t6.0t
with kitchen water for cooking20L/day1.00t2.0t10.0t20.0t40.0t
with shower80L/day4.00t8.0t40.0t80.0t160.0t
with laundry100L/day5.00t10.0t50.0t100.0t200.0t
with toilet150L/day7.50t15.0t75.0t150.0t300.0t
water used for living
(standard living)
water used for living in
an urban area
water used in a hotel1,000L/day50.00t100.0t500.0t1,000.0t2,000.0t
Selecting based on the usage purpose

Based on our rich performance data which we have been accumulating over many years, we can derive the optimum specifications/purpose regardless of the target, such as safe drinking water, daily life water, material water for beverages, and industrial water.

Water quality of the untreated seawater

Water quality of the tap water set as the standard


Our standard water quality

Water quality adequate for potable water

Highly pure water quality

Criteria for
potable water
Water quality Safe drinking
Purified water
Non-treated - Treatment method RO treatment TYPE20 2ND RO treatment
19,300.0mg/l <200.0 Chloride 121.2mg/l 16.0mg/l 4.7mg/l
6.0mg/l <10.0 Organic substances, etc. 0.3mg/l <0.1mg/l <0.1mg/l
0.1mg/l <0.3 Total iron ion TRACE 0 0
0.2mg/l <0.05 Manganese TRACE 0 0
3,100.0mg/l - Sulfate ion 13.0mg/l <0.4mg/l 0.4mg/l
10,837.8mg/l <200.0 Sodium 70.2mg/l 4.8mg/l 2.7mg/l
400.0mg/l - Potassium 3.4mg/l <0.02mg/l 0.2mg/l
2.7mg/l - Silica 0.1mg/l <0.03mg/l 0.03mg/l
0.2mg/l <0.8 Fluorine TRACE - TRACE
440.0mg/l <300.0
as CaCO3
Calcium ion 1.8mg/l 18.5mg/l <0.1mg/l
1,310.0mg/l Magnesium ion 5.8mg/l <0.2mg/l 0.2mg/l
150.0mg/l - Bicarbonate 1.3mg/l 7.5mg/l 0.1mg/l
8.3 5.8〜8.6 pH 7.1 7.0 6.2
35,541.0mg/l 500.0 or below Total dissolved solids 217.0mg/l 38.6mg/l 8.0mg/l
5,860ms/m - Electrical conductivity 40.5ms/m 7.0ms/m 1.5ms/m
500.0 100 or below General bacteria 0 0 0
Positive Negative Total coliforms Negative Negative Negative
4.0 2.0 or below Turbidity <1.0 0 0