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Filter media placed in net bags
Do not place long-term biological filter media
e.g. JBL MicroMec, JBL Sintomec, etc. in finely
meshed net bags. Only use the original JBL
CristalProfi filter media with the appropriate
foam edge for special problem solutions (Section
D)
Filter media not cleaned properly
Remove the filter media from the filter basket and
clean.
Incorrect filter media used
Only place fine filter media e.g. filter wool loosely
in the filter baskets so that water flow 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 fitted 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 clarifier, etc.) reduce the
water flow. 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
off 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 fit
correctly
Airstone too close to suction pipe
If air is additionally provided by an air pump,
check that there is sufficient distance between
the air stone and the suction pipe.
“IN” and “OUT” hoses mixed up
Reconnect hoses correctly
High flow resistance due to dirty filter media or
filter media in a net bag
Clean the filter media and do not use finely
meshed net bags for long-term biological filter
media (JBL MicroMec, JBL SintoMec). Only use
the original
JBL
CRISTAL
PROFI
©
filter media with
the appropriate foam edge for special problem
solutions (Section D)
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