16
11.
Failures
Problems with denitrification are mostly caused by wrong adjustion of the flow and feeding rate.
They can only be determined by measurements of nitrite and nitrate concentrations in the filter or
by measurements of the redox potential.
-
The pump produces noise: If the pump housing contains air or gas, this causes a strange noise.
In this case, the pump is pumping little or no water and its cooling is insufficient. The pump
may overheat and be destroyed. The housing of the pump has a small hole where air and gas
can escape. If this hole is blocked, it has to be cleaned with a needle.
-
Nitrite in the outlet of the filter: If the outlet of the filter contains high amounts of nitrite, the
feeding rate is too low. Increase the feeding (add 1 Denimar tablet per day) or lower the flow
rate. In most of those cases, the redox potential is too high (above -50 mV).
-
Nitrate in the outlet of the filter: High residual concentrations of nitrate often occur together
with high nitrite values.
Caution!
Most nitrate tests are disturbed by high nitrite
concentrations! In this case, the redox potential is also too high. Increase feeding rates,
decrease the flow rate.
-
Hydrogen sulphide in the outlet of the filter: The filter smells like fouling eggs. In most cases,
the redox potential is too low. Reduce the feeding, check the flow rate and increase it if
necessary.
-
The redox potential reaches values higher than zero. The flow rate is very low.
Measure the pH
in the reductor. If the pH is lower than 7.0 in seawater or lower than 6.0 in freshwater, add
some milliliters of a saturated solution of calciumhydroxide in freshwater with a syringe.
Increase the pH to values higher than 7.0.
12.Warranty
Should any defect in material or workmanship be found within 12 months of the date of purchase
AB Aqua Medic GmbH undertakes to repair or, at our option, replace the defective part free of
charge – always provided the product has been installed correctly, is used for the purpose that was
intended by us, is used in accordance with the operating instructions and is returned to us carriage
paid. The warranty term is not applicable on the all consumable products.
Proof of Purchase is required by presentation of an original invoice or receipt indicating the dealer’s
name, the model number and date of purchase, or a Guarantee Card if appropriate. This warranty
may not apply if any model or production number has been altered, deleted or removed,
unauthorised persons or organisations have executed repairs, modifications or alterations, or
damage is caused by accident, misuse or neglect. We regret we are unable to accept any liability
for any consequential loss. Please note that the product is not defective under the terms of this
warranty where the product, or any of its component parts, was not originally designed and / or
manufactured for the market in which it is used.
These statements do not affect your statutory rights as a customer.
If your AB Aqua Medic GmbH product does not appear to be working correctly or appears to be
defective please contact your dealer in the first instance.
Before calling your dealer please ensure you have read and understood the operating instructions.
If you have any questions your dealer cannot answer please contact us.
Our policy is one of continual technical improvement and we reserve the right to modify and adjust
the specification of our products without prior notification.
AB AQUA MEDIC GmbH - Gewerbepark 24 - 49143 Bissendorf/Germany
- Technical changes reserved -
