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Filter media placed in net bags
Do not place long-term biological lter media
e.g. JBL MicroMec, JBL Sintomec, etc. in nely
meshed net bags. Only use the original JBL
CristalPro lter media with the appropriate
foam edge for special problem solutions (Section
D)
Filter media not cleaned properly
Remove the lter media from the lter basket and
clean.
Incorrect lter media used
Only place ne lter media e.g. lter wool loosely
in the lter baskets so that water ow will not be
obstructed.
Pump is dirty
Clean pump chamber, impeller and cover with a
cleaning brush (specialist retailer) (10)
Water does not circulate properly Repeat start procedure (5)
Impeller and/or shaft tted crooked, shaft broken,
rubber bearings of shaft missing, bayonet lock on
impeller casing not positioned correctly
Dismantle, check, replace faulty parts and re-
assemble. Check that the shaft and bayonet lock
are correctly positioned.
Too many accessories attached to the hose
system
Accessories (e.g. UV-C clarier, etc.) reduce the
water ow. Remove accessories or operate with
own separate water circulation.
Air in filter
Cause Solution
The point of connection of the telescopic suction
pipe is above the water surface
When doing a partial change of water, siphon
o water to approx. 5 cm above the point of
connection only. Otherwise disconnect the plug.
Filter is positioned too high
The top of the pump head should be at least 20
cm below the water surface, the lower the better.
The hose installation leaks and draws in air
Check that all connections are airtight and t
correctly
Airstone too close to suction pipe
If air is additionally provided by an air pump,
check that there is sucient distance between
the air stone and the suction pipe.
“IN” and “OUT hoses mixed up Reconnect hoses correctly
High ow resistance due to dirty lter media or
lter media in a net bag
Clean the lter media and do not use nely
meshed net bags for long-term biological lter
media (JBL MicroMec, JBL SintoMec). Only use
the original JBL CRISTALPROFI
©
lter media with
the appropriate foam edge for special problem
solutions (Section D)
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33


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