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© Munters AB, 201
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5. Maintenance
The performance of pads can be influenced by the formation of either mineral deposits or algae. The methods
used for the prevention of either of the two are different and are described below.
5.1 Mineral Deposits
During the evaporative cooling process some of the water evaporates, but the mineral salts remain in the
water. This effectively increases the concentration of the mineral salts in the water, which leads to an increased
likelihood for the formation of mineral deposits on the surface of the pads. The thickness of such deposits
will increase over time and ultimately block the air passages and diminish the effectiveness of the pads. Below
are some helpful guidelines for the prevention of the formation of mineral deposits.
• Ensure there is sufficient water in circulation in the system. This helps to wash dirt down from the pads.
If 100mm thick pads are used, there should be at least 3.6l/min/running meter of gutter.
• Ensure sufficient bleed-off.
• In extremely dry circumstances the water quantity may be increased.
• too much water shouldn’t be pumped up because this would transform the cooling pad wall into a closed
water curtain jeopardizing the performances.
• Minimize the number of on/off wetting cycles for the cooling pads.
• Brush dry pads with a soft bristled brush when small crystals start forming. Ensure that the brush
strokes are in the direction of the sheets in the pad (up and down). Do not use chemicals on the pad.
5.2 Algae
Algae require three essential elements to survive:
• Light
• Water
• Nutrients
Anywhere that an abundance of the three are required, the likelihood of algae growth is high. Below are some
recommendations that will help to reduce the likelihood of algae growth
• Completely dry the cooling pads once every 24 hours.
• It is not recommended to use chemicals on a daily basis.
• Shade the pads and the tank.
• Flush and disinfect the entire system quarterly.
5.3 Regular maintenance
• Clean the filter of the plumbing kit and pump regularly, dirty filter can reduce the water flow rate by
50% or more.
• Check system regularly for damaged or clogged cooling pads and replace damaged pads.
