Rena Ware Aqua Nano HD CTU-300 Use & Care Manual page 13

MAINTAINING THE PRE-FILTER
BACK-FLUSHING THE PRE-FILTER
You should back-flush the Pre-Filter (up to three times) when a significant reduction
in flow occurs. The disposable EM Media Insert should be replaced if back-flushing the
Pre-Filter fails to restore acceptable flow.
IMPORTANT: NEVER BACK-FLUSH THE Aqua√HD™ CARTRIDGE.
Back-flushing the Aqua√HD™ Cartridge will damage its internal structure, causing
the filter to become ineffective. Back-flushing can also contaminate the downstream
media of the Aqua√HD™ so that it will no longer filter properly.
Note: The back-flushing process requires two people.
1. Make sure the water is turned off and remove the cover.
2. Remove the back-flow adapter from the Inlet Assembly.
3. Remove the Inlet Assembly by turning it counterclockwise until it releases.
4. Remove the Pre-Filter Cartridge from the Aqua√HD™ Cartridge by turning it
counterclockwise until it releases.
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