Ultrawave ARGON Operator's Instruction Manual page 14

Step 6 – Remove each filter housing using the tool provided, by turning the housing
locking ring left/anti-clockwise:
Step 7 – The filter can now be inspected and replaced if necessary. Please note the
right filter is the coarse filter (higher value uM filter) and the left filter is the fine filter
(lower value uM filter) when replacing the filter elements.
Step 8 – Repeat the same process for the second filter.
Before returning the isolation valves to their normal working positions make sure that
filter housings are replaced and re-tightened.
Return the two isolation valves to their original "on / open" positions.
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