Reverse Osmosis Water Quality
The permeate water produced by Reverse Osmosis technology is of an extremely high quality.
Reverse Osmosis not only reduces the salinity levels in the water but is one of the best water treatment processes for purifying water. The water produced is of superior quality than that required by NHMRC Drinking Water Standards.
Substance
|
NHMRC Drinking
Water Standard
|
Standard Seawater
|
RO Permeate
Drinking Water
|
Manganese
|
<0.10 mg/l
|
0.05-0.60 mg/l
|
Trace
|
Potassium
|
-
|
390-400 mg/l
|
6.25 mg/l
|
Sodium
|
<300 mg/l
|
11000mg/l
|
116mg/l
|
Magnesium
|
<70 mg/l
|
1313mg/l
|
4.84 mg/l
|
Calcium
|
<250 mg/l
|
411 mg/l
|
1.48 mg/l
|
Strontium
|
-
|
13.03 mg/l
|
0.05 mg/l
|
Barium
|
-
|
0.05 mg/l
|
0 mg/l
|
Carbonate
|
<500 mg/l
|
7.84 mg/l
|
0.0 mg/l
|
Bicarbonate
|
8mg/l
|
152 mg/l
|
5 mg/l
|
Nitrate
|
<0.60 mg/l
|
0.70 mg/l
|
0.04 mg/l
|
Chloride
|
<200 mg/l
|
19650 mg/l
|
196 mg/l
|
Fluoride
|
<0.80 mg/l
|
1.40 mg/l
|
0.02 mg/l
|
Iron
|
<0.30 mg/l
|
0.10-0.30 mg/l
|
Trace
|
Sulphate
|
<400 mg/l
|
2733 mg/l
|
3.30 mg/l
|
Silicon
|
-
|
3.86 mg/l
|
0.08 mg/l
|
Selenium
|
<0.01 mg/l
|
0.01 mg/l
|
0.0 mg/l
|
pH
|
5.8-8.6
|
7.6
|
6.55
|
Dissolved Solids
|
<1500 ppm
|
35606 ppm
|
333 ppm
|
|
Bacteria
|
0
|
500
|
0
|
Note: Once water is produced by an RO desalinator it is important that the water is stored in a sterile tank and treated appropriately. Dolphin Desalinators can advise on the best systems to maintain the high quality of your water once it is in storage.
Further Reading
The following documents are courtesy of the National Health and Medical Research Council and the Natural Resource Management Ministerial Council.
