Evolution Aqua nexus eazy 200 Installation & Operating Instructions Manual page 11

To achieve optimum water clarity we recommend that the "Eazy" be air
backwashed and purged on a regular basis. The frequency of cleaning will
depend on the loading of the pond. The longer the filter is left undisturbed the finer
the filtration will become. However the filter must be purged regularly to avoid
circulation pump starvation on a gravity system or chamber overflow on a pump
fed system.
Gravity Procedure
1) Stop the circulation pump.
2) Wait a short a period of time so as to allow the water levels within the Nexus
to stabilise.
3) Close off the feed to the biological chamber
by inserting the Isolation pipe into the centre of the "Eazy",
ensuring that the rubber flange engages
within the Nexus centre spigot.
4) Close the inlet to the Nexus by using the inlet slide-plate supplied with your
Nexus. You should now have isolated your "Eazy" from the System.
5) Open the air valve until the Kaldnes in the "Eazy" is boiling.
6) After the "Eazy" has been boiling for a minimum of one minute, open the
Nexus central chamber waste valve.
7) Once central chamber has drained, close waste valve.
8) Close the air valve.
9) Remove the Nexus inlet slide-plate allowing the Nexus to refill.
10) Remove the Isolation pipe from the centre of the "Eazy".
11) Restart the circulation pump.
Cleaning