JBL ProCristal UV-C Compact plus aquarium UV steriliser

Regular price 99,90 €
Regular price Sale price 99,90 €
33,30 € × 3 with no fees

This UV-C steriliser is installed inline on the filter return and treats green water and suspended pathogens, in both fresh and salt water. Its four power ratings cover 300 to 3,000 litres, each with its own maximum pump flow rate, and the lamp cuts out automatically when the housing is opened.

Ref. 6047000·UV-C steriliser
Power : 5 w
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The summary

  • What you receive: the unit with its lamp fitted, its connectors, wall bracket and instructions.
  • The figure that decides: the pump's maximum flow rate, from 300 to 1,000 L/h depending on the power.
  • What volume it treats: 300 to 3,000 L for disinfection, 100 to 800 L against green water.
  • What maintenance: replacing the lamp once a year, and cleaning the quartz tube.
  • How much room: a straight length of 32 to 61 cm depending on the model, outside the tank.
  • What protects you: the lamp switches itself off as soon as the casing is opened.

A green water treatment unit fitted inline on the filter return

The JBL ProCristal UV-C Compact plus aquarium UV steriliser fits in line on the filter return to treat green water and suspended germs, in freshwater and seawater alike. Its four power ratings, from 5 to 36 W, treat 300 to 3,000 litres for disinfection, and 100 to 800 litres against green water.

Green water is coloured by single-celled algae that float freely and pass through the filter sponges. A UV-C steriliser treats them where they are, suspended in the circulating water. The unit is installed in line on the return pipe of the external filter: the water runs along a lamp enclosed in a quartz tube, receives the radiation, then flows back to the tank. Nothing dissolves and nothing needs dosing, so no product is added to your water, and the treatment works continuously as long as the unit is running.

💡 What the UV-C reaches

The radiation acts on the DNA of the micro-organisms that pass in front of the lamp, whether single-celled algae, free-living bacteria or parasites at the swimming stage. It does not reach anything that does not pass in front of it. The bacteria settled in your filter media stay in place and carry on converting ammonia, because they are attached rather than carried along. A UV steriliser therefore does not break an established nitrogen cycle, and the article on the nitrogen cycle explains why the distinction comes down to the surface they live on.

🚰 The flow rate

The flow rate determines how effective the treatment is, because the faster the water passes the lamp, the less radiation it receives. Each power rating therefore has a maximum pump flow rate: 300 L/h for the 5 W, 500 L/h for the 11 W, 400 L/h for the 18 W and 1,000 L/h for the 36 W. The volume treated also depends on what you are trying to achieve, since the 18 W covers 1,500 L for partial disinfection but only 500 L against green water. If your filter delivers more than the stated value, move up to the next power rating or install the unit on a slower bypass, which a Y-fitting and a regulating valve are enough to create.

You're aiming for green water

The treated volume drops sharply. A 500-litre tank already needs the 18 W, and an 800-litre tank the 36 W.

You are aiming for the germs

The same unit covers three times the volume. The 18 W handles 1,500 litres, the 36 W handles 3,000.

Flow rate, lamp age and start-up

Connecting it to a pump faster than the model's maximum flow rate cancels out most of the treatment, with nothing to indicate it. Leaving it running with a lamp more than a year old amounts to the same thing, since it still lights up while it no longer sterilises. And switching it on before starting the circulation makes the lamp heat up in still water: only power it up once the water is moving.

Plan for a spare lamp

Note the date of commissioning on the casing and order the replacement lamp before the end of the first year, as it is the only consumable part of the unit and the effectiveness of the treatment depends on it. Also plan on a phosphate test if your water turns green again despite the unit, because an excess of phosphates encourages the return of algae, which the unit destroys without removing the cause.

🔒 Safety and lamp life

A magnetic switch cuts the lamp as soon as the housing is opened, which prevents any exposure of the eyes to the radiation. The body is double-walled glass and is UV-resistant. A UV-C lamp loses its germicidal power well before it burns out: it still gives off light, blue in colour, even though it no longer sterilises. That is why it is replaced on a schedule, once a year, and not when it goes out. Take advantage of this replacement to clean the quartz sleeve, whose limescale film blocks part of the radiation. A wipe with diluted white vinegar, followed by a thorough rinse, is enough to restore its transparency, and you can do it at the same time as cleaning the filter.

🐟 Aquarium, pond and planted circuit

The two higher-power models also treat a pond, with much larger volumes than in an aquarium: the 18 W covers 15,000 L for disinfection and 4,000 L against green water, and the 36 W reaches 30,000 L and 8,000 L, in both cases with a pump of 4,000 L/h at most. In a loop where fish and plants share the water, fit it on a secondary loop rather than on the main return, so that you clear the water without reducing the flow that feeds your growing beds. For algae that grow on the walls rather than in the water, the unit will do nothing, and the article on pond algae in summer describes the effective ways of tackling them.

🔁 When to run it

A steriliser does not necessarily need to stay switched on all year round. Against established green water, it runs continuously until the water clears, which generally takes a few days, and then it can be switched off until the next bloom. As a preventive measure on a pond exposed to the sun, it runs throughout the warm season and is switched off in winter. In an aquarium, once the water is clear, you can run it a few hours a day on a programmable socket. The lamp wears out according to its hours of operation: its 8,000 hours amount to about 11 months of continuous running, and a unit left on unnecessarily uses up its only consumable for nothing.

📦 What's in the box

The box contains the assembled unit with its lamp in place and its cable, connection ends, a 90-degree elbow, a wall bracket with its screws and the instructions. The cable is 2 m long on the 5 and 11 W models and 5 m on the 18 and 36 W models, and the unit needs a straight run of 32 to 61 cm depending on the model. Measure this length before ordering, because a powerful model is chosen for its flow rate but fitted according to the space available, and these two constraints do not always go together in a cabinet already occupied by an external filter.

Technical specifications

The essentials

Device type
In-line UV-C steriliserFits onto the filter's return pipe, outside the tank.
Power ratings
5, 11, 18 and 36 WLamp power, which determines the volume treated.
Suitable water types
Freshwater and marineThe two highest power ratings also cover larger pond volumes.
Safety
Magnetic cut-off on openingThe lamp switches off before the housing opens.

Volume treated and maximum flow rate

5 W
300 L, or 100 LPartial disinfection followed by green water, pump of 300 L/h at most.
11 W
800 L, or 200 LPartial disinfection followed by green water, pump of 500 L/h at most.
18 W
1,500 L, or 500 LPartial disinfection followed by green water, pump of 400 L/h at most.
36 W
3,000 L, or 800 LThe only model that accepts a 1,000 L/h pump.

Connection, lamp and dimensions

Pipe connectors
12 to 19, 16 to 19 or 12 to 40 mm12 to 19 mm on the 5 W, 16 to 19 mm on the 11 W, 12 to 40 mm on the 18 and 36 W.
Minimum straight length
32, 42 or 61 cm32 cm for the 5 W, 42 cm for the 11 and 18 W, 61 cm for the 36 W.
Lamp base
G23 or 2G11G23 on the 5 and 11 W, 2G11 on the 18 and 36 W.
Cable length
2 or 5 m2 m on the 5 and 11 W models, 5 m on the 18 and 36 W models.
Lamp lifespan
Around 8,000 hoursThe germicidal power drops off before the lamp goes out.
Warranty
2 years, plus 2 yearsThe extra 2 years are obtained by registering the appliance.

To budget for separately

Replacement lamp
1 tube at the bottom of the model, every year
Water circulation
A filter whose flow rate stays below the limit

8 further specifications are available in the detailed view.

In the box

  • 1 assembled steriliser, with its UV-C lamp, quartz tube and cable
  • 1 set of connector ends to be cut to the diameter of the pipe
  • 1 90-degree elbow fitting
  • 1 wall bracket and its screws
  • 1 installation leaflet

Treated volumes, maximum pump flow rates, bases, lengths and warranty recorded on 20/09/2026 from the JBL technical sheets, checked on 08/10/2026.

Manufacturer and product safety

Manufacturer
JBL GmbH & Co. KG
Postal address
Dieselstraße 3, 67141 Neuhofen, Allemagne
Website
www.jbl.de

Information provided under Regulation (EU) 2023/988 on general product safety.

Aquarium steriliser or pond clarifier?

The same UV-C treatment, on two circuits that have neither the same flow rate nor the same pipes.

Do you need an aquarium or a pond device? One is sized on the flow rate of your pump, the other on the stocking of your pond.

Maximum lamp power (W)Minimum lamp power (W)Choice of several power ratingsDesigned for the garden pondDesigned for the aquariumSizing guided by the stocking levelPrice
EHEIM Clear UVC pond UV steriliser, 7 to 60 WYour choice60 W7 W7YesNoYes58,90 €
Recommended
JBL ProCristal UV-C Compact plus aquariumYour choice		36 W5 W4YesYesNo99,90 €
EHEIM Clear UVC pond UV steriliser, 7 to 60 W
Power
Maximum lamp power (W)60 W
Minimum lamp power (W)7 W
Choice of several power ratings7
Intended use
Designed for the garden pondYes
Designed for the aquariumNo
Sizing guided by the stocking levelYes
JBL ProCristal UV-C Compact plus aquariumRecommended
Power
Maximum lamp power (W)36 W
Minimum lamp power (W)5 W
Choice of several power ratings4
Intended use
Designed for the garden pondYes
Designed for the aquariumYes
Sizing guided by the stocking levelNo

Lamp wattages, volumes treated and uses taken on 20/09/2026 from the technical datasheets of the two manufacturers.

Estimate your
delivery time

Long, fragile parcel, protected for the quartz tube. Dispatched within 48 hours by Colissimo or Chronopost home delivery, to be chosen at checkout. The exact cost depends on the method selected.

Frequently asked questions

10 questions

6 key questions, 10 in the detailed view

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