[References](/in/en/references/) / [Cover balls](/in/en/references/?category=cover-balls) 19 October 2020 # Covering water reservoirs with outdoor cover balls One of the biggest problems of efficient water management is water loss due to evaporation. It is very difficult to prevent and control it in a water reservoir due to the large surface present. However, our outdoor cover balls solve this issue very simply: our Bird Ball™, the water-filled Bird Ball™ and the Self-Filling Ball® are great for this exact purpose and deal with this problem effectively, as they can cover 91% of the surface of the reservoirs. Evaporation water loss can be reduced by up to 90% because the size of the open water surface is minimized, and the impact of environmental factors affecting to the rate of evaporation will be much milder. In addition, their use in the preservation of water quality is advantageous, because the formation of algae and the growth of aquatic plants become a controllable process. The balls are worth installing on virtually any type of water reservoir, because its benefits can be exploited everywhere: whether it is a drinking water reservoir, an irrigation water reservoir or a fire water reservoir. Here are some of our projects we were involved with, that have taken place in Germany, Turkey and Hungary. ### Related Product [ Cover balls The Euro-Matic outdoor cover ball is the best choice for airports, mines, sewage treatment plants and livestock farms, as well as for covering reservoirs. Learn more ](/in/en/products/cover-balls/)### What is a cover ball? The cover ball is a hollow high quality plastic ball that can be used to create a continuous cover layer on the surface of liquids. Depending on the amount of balls placed on a given surface, they can cover up 91% of the surface in a regular shape, self-arranging next to each other. This cover layer separates and isolates the open surface of the liquid from its surroundings, i.e. it significantly reduces the effect of the liquid on the environment and vice versa. In English, several names are used for these balls, often referred to as ‘shade ball’, ‘cover ball’, ‘armor ball’, ‘barrier ball’, or ‘bird ball’. We, as a proud European Manufacturer, call them cover ball and Bird Ball™. [VIEW OUR PRODUCTS](https://euro-matic.eu/in/en/shop/?category=cover-balls) ### How does it work? What can it be used for? The cover balls have countless benefits, so it can be used in many diverse areas. Those advantages usually help our partners to achieve their goals for cost-saving, more efficient water management, safer work environment, environment and nature protection. Thus, the Bird Ball™ is an excellent solution for reducing evaporation, preserving water quality, preventing algae formation, keeping birds away, camouflaging the water surface, thermal insulation, reducing heating costs, reducing the release of toxic gases and vapors, reducing unpleasant odors, covering hazardous materials and many more, where cost savings or other beneficial effects can be achieved as a result of use. ### ### Types **Bird Ball™****Water-filled Bird Ball™****Self-Filling Ball®** Diameter100 mm100 mm100 mm Weight40 g240 g40 g MaterialHDPEHDPEHDPE UV resistanceYesYesYesColorBlackBlackClear/black Warranty10 years10 years10 years Wind resistanceUp to 80 km/hUp to 150 km/hUp to 150 km/h PackagingBig-bag, cardboard or in bulkBig-bag or in bulkBig-bag, cardboard or in bulk Quantity116 balls/m2116 balls/m2116 balls/m2 [SEND ME AN OFFER](https://euro-matic.eu/in/en/get-a-quote/) ## Shop Cover balls [See all products](/in/en/shop/?category=cover-balls) [Fish Ball 38/50 mm 8,3 g clear € 120,00 / 1000 pcs ](/in/en/shop/fish-ball-38-50-mm-8-3-g-clear/) [Fish Ball 38/50 mm 8,3 g transparent blue € 126,00 / 1000 pcs ](/in/en/shop/fish-ball-38-50-mm-8-3-g-transparent-blue/) [Bird ball™ 100 mm 40 g black ](/in/en/shop/bird-ball-TM-100-mm-40-g-black/) [Water-filled Bird ball™ 100 mm 240 g black ](/in/en/shop/water-filled-bird-ball-TM-100-mm-240-g-black/) ### Related News [ We have moved into a bigger warehouse! 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Cover balls ](/in/en/news/the-effectiveness-of-biological-wastewater-treatment-facilities-can-be-improved-let-s-see-how/) [ Odor control and evaporation reduction in wastewater treatment Cover balls ](/in/en/news/odor-control-and-evaporation-reduction-in-wastewater-treatment/) [ Evaporation losses could take millions out of farmers’ pockets Cover balls ](/in/en/news/evaporation-losses-could-take-millions-out-of-farmers-pockets/) [ Slurry treatment with cover balls Cover balls ](/in/en/news/slurry-treatment-with-cover-balls/) [ Irrigation and evaporation – how to protect our water resources and the health of our plants Cover balls ](/in/en/news/irrigation-and-evaporation-how-to-protect-our-water-resources-and-the-health-of-our-plants/) [ Shade Balls: Know More Save Money! 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