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In households:
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for preparation of food and drinks
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for car batteries and flat irons
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for home plants, especially orchids, bromelids and cacti
In laboratories and industry:
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everywhere, where up to now distilled or deionized water has been used and a conductivity of >20 µS is
accepted.
4. Maintenance
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Rinsing: For rinsing the membrane, the flush valve (Fig. 1, No. 11) has to be opened. Afterwards, the water
flows at full speed through the reverse osmosis module and flushes most contamination and residues.
This should be done after each production of osmosis water for 5 minutes (dependent on contamination and
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produced quantity of osmosis water). Afterwards, the flush valve can be re-mounted and the unit is ready
for next production. By rinsing the membrane, possible deposits in the membrane are avoided and thus, the
life span of the membrane is extended.
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Pre-filter: If the tap water is not extremely polluted, a yearly replacement of both pre-filters will be
sufficient. If the water is higher polluted, the filters have to be changed more often - as required. If the pre-
filter is blocked, the water production will slow down. On changing the pre-filter, always rinse it before
mounting it to the osmosis module.
Membrane: The membrane normally has a lifetime of several years. Afterwards, it has to be replaced.
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5. Failures
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Waste water or pure water flow rate is too low:
Check the pre-filter for blocking. Connect water inflow directly to the module. If the waste water flow is
normal again, change the pre-filter. If the flow is still too low, the flush valve or membrane is blocked or has
to be renewed.
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Tap water pressure is too low:
If you are connected to a municipal water supply, you are not able to influence the water pressure. For the
reverse osmosis unit, a minimum water pressure of 3 bar is required.
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The membrane is blocked or used up:
The membrane has to be changed.
As spare parts all standard 18"- membranes with the model specific capacity can be used. Only TFC-
membranes made of Polyamide/Polysulfone should be used. We recommend to use original Aqua Medic TFC-
membranes. If you want to use a membrane with a different capacity, you also have to change the flush
valve.
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Rejection rate is too low:
Check water flow rates (waste water, pure water). Maybe the pre-filter has to be changed.
If the water flow is ok, flush the unit for approx. 60 minutes by opening the flush valve. If the rejection rate
increases, go on flushing until the value is acceptable. If the rate does not improve, change the membrane.
6. Important Notes
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Connection: Connect the reverse osmosis unit only to cold water supply. Higher temperatures increase the
pure water production but at temperatures above 40 °C, the membrane will be destroyed.
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Stopping the unit: If you stop the unit, always close the tap water supply. If you run the unit automatically
with a solenoid valve, switch the valve between pre-filter and module. Take care that waste water and pure
water can flow away freely.
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Disconnection of the unit: If you want to disconnect the unit for a longer period than 6 weeks, you should
add disinfection liquid into the module housing. If the unit is started again, flush it for 15 – 20 min. We
recommend flushing also after shorter periods of stopping.
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Storage: The unit has to be stored at temperatures above 0 °C. Freezing would destroy the membrane.
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Temperature: At low temperatures in winter, the permeate production slows down.
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