Ultrawave ARGON Operator's Instruction Manual page 6

The Argon Series recirculation and dual filter system is situated below the weir area,
accessible behind the front black hinged panel.
There is an isolation valve on the input and output side of the dual filter system.
Please ensure these valves handles are in line with the pipework as this is the open
position.
Before filling the unit for the first time it would be advisable to fit the recirculation filters,
please see page 11.
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