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Most common watermakers used on yachts and ships use the inverse osmosis system to obtain fresh water from seawater

Regardless the size and range of the system, a watermaker has 3 different stages on his operational:

  • Seawater filtering

  • Pressurizing

  • Inverse osmosys with separation of salt

Inverse osmosys with separation of salt

The Inverse Osmosis unit separates the salt from water, obtaining a good quality of fresh water and disposing the rest with a high concentration of salt. The ratio between fresh water and the remaining water with high concentration of salt gives a level of the efficiency of the entire process, which grows as it grows with the size of the system. The Reverse Osmosis unit can be made up of one or more membranes contained whitn “vessels”.

Fresh water obtained can be further treated, if necessary, with a UV sterilization that reduces definitively the bacterial and pathogenic load in general and with a post-filtration with activated carbon, to improve its organoleptic characteristics.

Watermaker choice is subject to the capacity needed, the raw water to be treated characteristics and the fresh water quality to be obtained.

Any watermaker needs a flushing system (manual or automatic), which is used to carry out periodic "washing" with fresh water and to ensure efficiency and durability of the machine and its components.

Wash the membrane with fresh water at the end of cycle production for about 3 minutes, at a pressure not exceeding 15 bar. If the unit is not in use it must be rinsed every week with fresh water as the water tends to stagnate inside the membranes, causing a buildup of bacteria. By washing through with clean water the membranes are kept clean and efficient. Check also the pre filter cartridges periodically, if they have a dark colouring, they need to be replaced.

Idromar winterizing

For prolonged periods of stop and in any case at the end of the season it is necessary to carry out a special maintenance of the membranes and the winterizing of the system. This maintenance consists in washing the membranes with 2 different products. The first wash (Regeneration) is done using the powder CRT which descales the membranes, the second wash (Winterizing) uses the liquid product FLD which sterilizes the membranes.

Dissolve all the CTR powder contained in a bottle, into a perfectly clean bucket and mix it with fresh water until it is totally melted. Pour the CTR product into a 100-liter container filled with fresh water. It is important that the capacity is large, since the regeneration process occurs within a closed circuit, so a small volume of water might be overheated, causing serious damage to the membranes.

Once the closed circuit has been created, the membranes can be washed. The regeneration process must be performed at a pressure of about 15 bar for 30 minutes. Once the process has been completed, the regeneration tank can be emptied.

After the regeneration washing of the membranes repeat the procedure using the liquid FLD product to sterilize the membranes. The only difference lies in the product to use. Place 100 lt of fresh water into the container and put inside all the product IDRO55(fluid). Be careful when you handle the product, do not smell it or rub your eyes, if you have touched the product. Re-start the system with unchanged pressure and make the product circulate for about 15 minutes within a closed circuit keeping a 15 bar pressure. Then, empty the regeneration tank. At this point the regeneration and winterizing operations are completed, re-set valves to running position and take off the hoses used for regeneration and winterizing. Keep the 3-way valve in horizontal position (closed).

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