JBL ProCristal UV-C: I had cyanobacteria in the aquarium and have removed them mechanically. There are probably still some freely floating around and I would like to know whether they can be killed off with UV-C.
A UV-C lamp can also kill off cyanobacteria floating freely in the water.
JBL ProCristal UV-C: Does UV light destroy the active substances of my aquatic plant fertiliser?
UV-C light degrades the chelators in the fertilisers which prevent the precipitation of trace elements, such as iron and some others. When using a UV-C clarifier we therefore recommend you switch to a daily dosing. At the beginning simply convert the standard dosage into a daily dose. It may be necessary later to increase the fertiliser dosage. Before each fertiliser application iron needs to be measurable at least in traces. Vitamins and other superior organic compounds also get degraded in the same way. Therefore a dosage of vitamins on the food is advised twice a week.
JBL ProCristal UV-C: When is the permanent use of the device recommended?
When you have problems with bacterial infections on animals, the permanent use of the UV-C device is especially recommended. This is the only way to achieve an effective reduction of the germ load in the water. If no cases of illness are present, the operation can be limited to 12 h per day.
JBL ProCristal UV-C: What do you mean by flow rate and do I need to reduce the filter performance?
By flow rate we mean the actual water flow through the UV-C water clarifier. If you connect the UV-C device behind the filter, all of the water which is run by the filter flows through the water clarifier, and the germ-inhibiting effect takes significantly longer (with regard to the total water amount of the aquarium). With powerful filters either the separate installation by means of a small circulation pump or the operation in bypass mode is recommended. This means running the water from the filter outlet to a y-piece (separation of the water), with the water clarifier installed in one of the water cycles, and then you can reconnect both hoses over a second y-piece, before the water flows back into the aquarium.
Can a ProCristal UV-C 5W be equipped with an 18W bulb?
No, unfortunately this is not possible. But you have the option to join a second ProCristal UV-C device to the 5W device with the help of the QuickConnect.
How often does the glass cylinder need to be cleaned?
Deposits (dirt, limescale etc.) inside the casing prevent the optimum efficacy of the UVC water clarifier. Therefore the inside of the appliance needs to be cleaned about twice a year, more frequently if the performance significantly deteriorates.
How can I extend the performance of the JBL ProCristal UV-C devices?
With the JBL QuickConnect you can join two ProCristal UV-C devices together. It doesn't matter whether they have the same performance.
If I want to add JBL Denitrol to my aquarium, do I need to switch off the UV-C device?
Yes, this would be useful. The bacteria need a little time to settle on the substrate. Until then they are floating freely in the water so that the UV-C radiation can kill them off. It is therefore recommendable to switch off the UV-C clarifier for a day.
How much power does a JBL ProCristal UV-C 18 W water clarifier consume?
A JBL ProCristal UV-C water clarifier consists of the UV-C burner and an electronic ballast. The ballast itself needs a low amount of electricity. The total output of the UV-C water clarifier is therefore slightly higher than the power, converted into UV-C light. Further information can be found on the type plate and the operating instructions.
In the instruction manual illustration for the JBL ProCristal UV-C the UV-C water clarifier is pictured connected behind the filter in an aquarium, yet it is pictured in front of the filter unit in the pond. What is the reason for that?
A UVC water clarifier is generally connected at the outlet of the pump in order to ensure a proper flow.
In the majority of pond filters (with the exception of pressure filters), the filter holder is higher than the pond water level and the water flows out of the filter and down into the pond. The pond pump is in the pond. This is why the UVC water clarifier needs to be installed between the pump and the filter unit, to prevent the water from flowing back into it and blocking it.
I have green water in my aquarium, and even water changes and changing the filter media only helps for a short time.
Green water means floating algae, which grow when they have no competition from other plants and, even more, when the excrement of the fish creates excessive nutrient pollution in the water. The filter will not be able to do much about this. Ultimately, there are only two possibilities:
1. Carry out significantly more water changes in order to remove the nutrients caused by fish excrement.
2. A JBL AquaCristal UVC clarifier kills off the floating algae.
A temporary measure is to switch off the light for 2-3 days in order to stop photosynthesis in the algae.