Water Quality Standards And Recommendations - Neslab System I Liquid to Liquid Instruction And Operation Manual

Water Quality Standards
and Recommendations
Permissible(PPM)
Microbiologicals
(algae,bacteria,fungi)
Inorganic Chemicals
Calcium
Chloride
Copper
Iron
Lead
Magnesium
Manganese
Nitrates\Nitrites
Potassium
Silicate
Sodium
Sulfate
Hardness
Total Dissolved Solids
Other Parameters
pH
Resistivity
* Megohm-Cm (Compensated at 25C)
Unfavorably high total ionized solids (TIS) can accelerate the rate of galvanic
corrosion. These contaminants can function as electrolytes which increase
the potential for galvanic cell corrosion and lead to localized corrosion such
as pitting which can be observed at the studs and on the outside surface of
cooling coils. Eventually, the pitting will become so extensive that the coil will
leak refrigerant into the water reservoir.
As an example, raw water in the United States averages 171 ppm (as NaCl).
The recommended level for use in a water system is between 0.5 to 5.0 ppm
(as NaCl).
Recommendation: Initially fill the tank with distilled/deionized water. Do not
use untreated tap water as the total ionized solids level may be too high.
- 7 -
Desirable(PPM)
0
<40
250
1.3
0.3
0.015
<12
0.05
10 as N
<20
25
<20
250
17
50
6.5-8.5
0.01*
0
0.6
<25
1.0
<0.1
0
0.1
<0.03
0
0.3
<1.0
0.3
<50
<0.05
10
7-8
0.05-0.1*