JBL CristalProfi 60 Manuel D'utilisation page 28

Impeller casing dirty
Impeller faulty or blades broken
Air in filter
Cause
High flow resistance due to dirty filter material or filter
material in net bag
Flow regulator on pump head stiff
Cause
Limescale deposits
Fish dead and/or water cloudy
Cause
Nitrite poisoning due to too rapid change from "old" to
"new". Cleansing bacteria thrown away with old filter.
Specially designed filter material for problem cases
(available at your specialist pet shop)
JBL BioNitratEx
Solves algae problems by biologically eliminating nitrate in freshwater.
Foam cartridges which have been enriched with bacteria nutrient in a special process to promote colonisation by
22
Clean impeller casing, impeller and cover with cleaning
brush (8)
Dismantle, check, replace faulty parts and re-assemble.
Solution
Clean filter material and only use biological filter
material (JBL MicroMec mini) in special filter baskets
(accessory).
Solution
Hold water outlet firmly and gently pull flow regulator
upwards. Clean with JBL BioClean A (specialist pet
shop). Rinse in water and reassemble.
Solution
Run an old and new filter parallel for 2 weeks in the
same aquarium or incorporate 1/3 of the old filter
material in the new filter. Never carry out a "general
clean up" of the aquarium at the same time!