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4. Maintenance
- Flushing: In order to flush the membrane, only the flushing valve has to be opened. Then, the
water flows with high speed through the narrow channels in the membrane and takes most of the
residuals with it. This flushing also cleans the flushing valve itself.
After 15 - 20 minutes, the valve must be closed again. A minimum water flow (approx. 12 – 20 /
15 - 24 l/h) has to be guaranteed.
- 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.
- Membrane: The membrane has a lifetime of several years. Afterwards, it has to be replaced.
- Flushing valve: The flushing valve is a part with limited lifetime. In case of a decrease of the
adjusted water flow, the valve is encrusted with calcium and can be cleaned using acid (e. g.
vinegar). If the water flow increases, the valve has to be replaced.
5. Failures
- Waste water flow rate is too high: Close the flushing valve. If this is not possible, the flushing
valve has to be replaced and the membrane power to be checked.
- Waste water flow rate is too low: Check if the pre-filter is blocked. The water pressure at the
pressure gauge behind the pre-filters must not be much lower (at the most 0.5 bar) than the
water supply pressure. Maybe change the pre-filter.
- Pure water flow rate is too low: Check the waste water flow rate. If it is to low too, change
the pre-filter.
- Tap water pressure is too low: If you are connected to a municipal water supply, you are not
able to have an influence on the water pressure. For the reverse osmosis unit, a minimum water
pressure of 3 bar is required.
- Module is blocked or used up: The membrane has to be replaced. As spare parts, all standard
„18" membranes with a daily capacity of 75 - 90 / 120 - 150 l can be used. Only TFC-membranes
made of Polyamide/Polysulfone should be used. We recommend to use original Aqua Medic TFC-
membranes only.
If you want to use a membrane with a different capacity, you also have to change the flushing
valve.
- Rejection rate is too low: Check the water flow rates (waste water, pure water). If the water
flow is ok, flush the unit for approx. 60 min. If the rejection rate increases, go on flushing until
the value is acceptable. If the rate does not improve, change membrane.
6. Important Notes
- Connection: Connect the reverse osmosis unit to cold water supply only. Higher temperatures
increase pure water production but at temperatures more than 40 °C, the membrane will be
destroyed.
- Stopping the unit: If you stop the unit, always close tap water supply. Never only close the pure
water tap. 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.
- Disconnection of the unit: If you want to disconnect the unit for a longer period than 6 weeks,
you should add Aqua Medic disinfection liquid into the module housing. If the unit is started
again, flush it for 15 to 20 minutes. We recommend flushing also after shorter periods of
stopping, if no disinfection liquid has been used.
- Storage: The unit has to be stored at temperatures above 0° C. Freezing would destroy the
membrane.
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