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© Munters AB, 201
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2. Before using
WARNING! The presence of Chlorine in the water will cause corrosion to the Gutter. DO NOT USE
water containing Chlorine.
WARNING! The presence of Chlorides in the water will cause corrosion to the Gutter. DO NOT
USE water having Chlorides content higher than 200mg/l.
WARNING! Do not expose the gutter system to substances containing barium polysulfide
(insecticides, pesticides and fungicides) as irreversible damage may occur to the gutter system.
Please note the limits for make-up water and sump water at ambient temperature for evaporative cooling
systems.
Constituent
Make-up* Water Sump ** Water
Reasons
Chlorides (as Cl)
<50 mg/l
<200 mg/l
High Chlorides will cause corrosion of metal
parts. Chlorides are contributed by contaminants
such as sodium chloride. Chlorine is a minor
contributor
Chlorine or
Bromine
0-1.5 mg/l ***
0 mg/l
Chlorine and bromine will rarely control algae
because they are
both very volatile and will not stay in the water.
Both will turn
Munters pads soft and shorten their life.
pH
6.0-8.5
7.0-9.0
Low pH is acid and will cause the paper to be
brittle. High pH is
more like lye and causes the paper to become
fluffy like cotton.
Pads will last the longest with a pH of 7 to 9. If
the water absorbs
ammonia from the air drawn across the pads,
the pH can increase to as high as 10.5. Bleed off
definitely helps to control pH.
*) Make-up water is the water supply needed to replace the water which is lost by evaporation in a closed-circuit gutter system;
**) Sump water is the water found in the covered tank or cistern;
Sources of water:
• Deep wells or municipal water supplies are recommended;
• ***) Chlorinated municipal make-up water is not recommended for spray on pads;
• Lake and river water should be filtered and chemically treated for microbial growth;
• Seawater, brackish water and reclaimed water are not recommended;
• Rainwater, reverse osmosis water, demineralized water and zeolite softened water should be used with
caution. Consult Munters before using.
Note: only pure water evaporates from the evaporative cooling pads. Naturally occurring components such
as sodium and chlorides, minerals and contaminants such as sulfur or barium present in the water, do not
evaporate. Over the time, as these substances concentrate in the remaining water, they can become harmful
resulting in damaging the gutter system and the evaporative cooling pads.
Any disregard of the above warnings and recommendations shall exonerate the manufacturer from any liability
and shall be considered improper use of the gutter system.
