FRESH WATER FLUSH PROCEDURE
Caution: The fresh water pressure should not exceed the range of the low pressure gauge/s. The
installation of a pressure reducer may be necessary.
If you don’t use your watermaker for the next three days, you will need to flush your system with fresh
water or infuse a biocide solution.
The fresh water flush prepares your watermaker for a shut down period of seven days maximum.
1) Open the pressure control valve all the way (two full rounds after the spring releases) counter clock
wise.
2) Close the sea water intake valve or switch the cleaning/storage valve to the closed position.
3) Open the fresh water flush valve. Your vessel’s fresh water system pump should now turn on (larger
fresh water pumps will cycle on and off). For the next flush procedure, test how long it takes until
the brine at the outlet becomes fresh. Allow fresh water to flow until all salt water is flushed out of
the RO System.
4) Open the seawater intake valve and switch the cleaning/storage valve to the sea water position.
Allow fresh water to flow until all salt water is flushed out of the pre-filter(s), boost pump and the
sea strainer (approximately 30 seconds, depending on the flow rate of your vessel’s fresh water
pump).
5) Close the sea-water intake valve.
MEMBRANE STORAGE PROCEDURE
If you intend to store your watermaker for more than seven days, growth of micro-organism will degrade the
RO membrane(s) performance.
The RO membrane(s) should be flushed with a biocide solution. This will preserve the membrane for long-
term storage of up to one year.
1. If you have installed the optional fresh water flush system, back flush the pre-filter(s), the boost
pump and the sea strainer with fresh water and remove the pre-filter cartridge(s). Close the
seawater intake valve (sea cock).
2. In a clean plastic container, mix 2.5 gallons / 10 litres of un-chlorinated fresh water with 100
grams (1/3 container) of Echo Tec. membrane preservative # 3 (Metabisulfite) for models 200-
900.
Mix 4 gallons / 15 litres of water with 150 grams (1/2 container) of preservative for the models
1200 and 1500.
3. Switch the three-way valve to the cleaning/storage position. Switch the diverter valve to the
sample position.
4. Open the pressure control valve all the way counter clockwise (two full rounds after the spring
releases).
5. Use a funnel (avoiding air to enter the system) to pour the solution into the cleaning/storage
hose or lead the hose into the elevated plastic container while running the high-pressure pump.
When the solution has been infused, switch off the watermaker.
Under best conditions your watermaker is now prepared for a shut down period of ten months.
Discard the product water for at least thirty minutes of initial operation, after storage before drinking or before
use in food preparations.
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