Getting Started - Evolution Aqua Nexus Eazy 200 Installation & Operating Instructions Manual

The gravity return pipe work from the exit point of
the Nexus to the pond needs to be a minimum of
75 mm (external diameter) and should have no
restrictions. Great care should be taken to ensure
that no air locks are created within the gravity re-
turn pipe work. The pipe work from the pond pump
to the inlet of the Nexus will need to be connected
to the rubber 50 mm connecting adapter that is fit-
ted to the inlet of the Nexus. A PVC reducer may
be required, the size of which depends on the size
of the pipe you have chosen to connect the pump
to the Nexus. The 75 mm (minimum) gravity return
pipe work will need to be connected to the rubber
adapter on the exit point of the Nexus. This pipe is
then extended / returned to the pond or waterfall
as required.
Gravity Fed Installation Section 200 + 300
Once you have positioned the Nexus, please
connect the pipe work in accordance with your
requirements.
Recommendations:
The rubber 110 mm / 4 " boot supplied will go onto
the inlet point, connecting the Nexus to the pond
after the recommended isolating valve has been
fitted between the bottom drain and your Nexus.
The other rubber boot (supplied) will then fit onto
the outlet side of the Nexus to connect the outlet
to your circulating pump. A PVC adapter / reducer
may be required.
Air Pump Installation Pump + Gravity
Now that you have your Nexus installed, we need to
get the Kaldnes installed and the airpump attached
to circulate it. This will be circulated permanently in
the outer biological chamber when your system is
running and for cleaning only in the central cham-
ber when maintaining the Eazy (Fig.21). Your choice
of air pump will depend on how much Kaldnes you
have in your biological chamber...see table. The
size of air pump required will depend on the amount
of K1 media used.
Air Pump Size
15/20 litres per min
40 litres per min
80 litres per min
The air pump is connected using a
pipe (10 mm inner diameter) to the
air ring inlet which is positioned on
the outside of the Nexus). It is
recommended to position the air
pump higher than the surface water
level in the Nexus to prevent water
flowing back into the air pump when
it is switched off (see fig. 22).

Getting Started

Empty your correct amount of K1 into the empty
outer biological stage. Fill your Eazy with its appro-
priate amount (Fig.4). Once the nexus is plumbed
in, the pump is fitted and the media is in, it is ready
to be started. As with anything, maintenance is an
individual and personal thing. Cleaning and main-
taining the Nexus will depend on flow rate, feed,
stocking, blankert weed etc. A summer pond after
a blanket weed treatment will obviously need more
care than a December unheated pond with no
food fed. Be aware that any movement of the Eazy
K1 will disturb fines back into the pond. The biome-
dia k1 is zero maintenance. The cleaning regimes for
both pump and gravity installations are listed below.
When all the connections have been made the Nexus
filter may be filled from the pond and the air pump
switched on. The K1 media will not attain neutral
buoyancy completely to begin with. Most of the
media floats, which is normal. In existing mature pond
water the media may start to circulate fully in as lit-
tle as 2 - 3 hours. In a newly filled and stocked pond
this full movement may take up to a week to occur.
Either way a constant and even circulation should be
achieved throughout the chamber. (For more
information about this please read the Kaldnes K1
media section).
System running and maintenance :
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. How-
ever the filter must be purged regularly to avoid circu-
lation pump starvation on a gravity system or chamber
overflow on a pump fed system.
Cleaning Gravity Procedure
1
Stop the circulation pump.
2
Wait a short a period of time so as to allow the
Fig. 21
water levels within the Nexus to stabilise.
Capacity of K1 media
50 litres of K1 media.
100 litres of K1 media.
100-150 litres of K1 media.
Nexus Eazy Rev. 1.04
Fig. 22
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