Name: JBL PROCRISTAL UV-C Compact plus 18 W
Brand: JBL
SKU: 6047200
Price: 212.54 EUR
Availability: InStock
Rating: 4.9 (8 reviews)

Crystal-clear and healthy water
Poor light conditions, over-fertilisation or even a surplus of nutrients can have negative effects on the aquarium water and may promote algae growth. Floating algae lead to green, bacteria to white clouding. The JBL water clarifier eliminates cloudiness caused by bacteria and floating algae. The aquarium water passes through the sturdy, UV-resistant casing of the clarifier. The UV radiation kills off bacteria, other germs and floating algae as the water passes through. The efficiency of this UV-C water clarifier is particularly high, as the glass bulb is surrounded by a polished, reflective stainless steel foil, which reflects the UV-C radiation and thus doubles the efficiency. This can also help to eliminate persistent algae, such as thread algae, since their spores are also largely killed off.

No harmful side effects
No change of the water values / no negative influence on the essential cleansing bacteria in the filter.

Easy to install
Connect the water clarifier to the external filter or a separate water pump. Thanks to the 90° elbow included in the pack any installation position is possible.

Safety
The JBL UV-C Water Clarifier is TÜV tested and has a safety switch for an automatic switch off when the device is opened. The casing is UV-resistant, consists of sturdy walls and has an LED light that indicates whether the UV-C bulb is switched on.

Difference to the previous model JBL ProCristal UV-C Compact:
The function indicator light is now mounted on the flat side of the electrical unit and the microswitch for the automatic switch-off of the burner when the housing is opened (if the plug has not been removed) has been replaced by a magnetic safety switch. This means that the electrical units of the previous models (Compact) do NOT fit the new ones (Compact Plus) and vice versa.

Are two seals on top of each other twice as tight?

The question itself sounds strange and the answer is not surprising. No, do not use two seals under any circumstances. If a seal is not tight, it may already have aged too much or be defective. Two seals on top of each other take up too much space and do not provide increased tightness, on the contrary. Therefore, replace a seal that does not work. By the way: with JBL SiliconeSpray you look after your seals and significantly improve their service life.

Is the UV-C bulb defective if it rattles and there is a small ball inside?

No, this bead consists of mercury and is absolutely necessary. The bulb is only defective if the ignition filament is torn.
After the lamp has been ignited, the temperature inside increases and liquefies this bead, creating mercury vapour. The resulting ionisation processes ensure the desired UV-C radiation to kill germs, bacteria and algae. Due to the mercury content, used UV-C bulbs may only be disposed of at appropriate collection points (e.g. for fluorescent tubes).

How often does the UV-C bulb need to be replaced?

How often a UV-C bulb needs to be replaced, for example in the JBL PROCRISTAL UV-C Compact plus units, depends on its operating system. After a maximum of 6000 - 8000 operating hours, the output will have dropped so far that a change is necessary. In the case of continuous operation (24 hours), a replacement will be necessary after 250 days. That’s why in ponds the bulb is best changed in spring while the technology is being restarted.

When is the permanent use of a UV-C device recommended?

With problems concerning bacterial infections of animals, we recommend the permanent use of JBL PROCRISTAL UV-C Compact plus, or similar. 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.

Why is combatting cloudiness less effective than partial sterilisation?

A partial sterilisation (against bacteria) is more effective than eliminating clouding caused by floating algae. Why? Because the cell structure of bacteria is quite simple. That’s why it is easier to destroy the cells of bacteria than those of algae.

Show more FAQs ...

Should the UV-C water clarifier continue to run when medications are in use?

When using medications you should definitely switch off the UV-C water clarifier.

Can, for example, a 5 W UV-C unit be equipped with an 18 W bulb?

No, unfortunately this is not possible. However, it is possible to connect a second JBL PROCRISTAL UV-C Compact plus unit to a 5 W unit via the JBL PROCRISTAL UV-C QuickConnect.

How can I extend the performance of the JBL ProCristal UV-C devices?

With the JBL PROCRISTAL UV-C QuickConnect you can join all PROCRISTAL UV-C devices together. It doesn't matter whether they have the same performance.

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 long does a UV-C device need to be in operation each day?

Without an onsite assessment we are unable to recommend how long your UV-C device needs to be in operation each day. For this we need to know the germ load and the regeneration level of the germ density in the aquarium. However based on values of our own experience we would recommend running the device for an absolute minimum of 12 h a day. A continuous operation is, however, better for the durability of the bulb.

Does a UV-C device kill free floating cyanobacteria in the aquarium? I have mechanically removed cyanobacteria in the aquarium. Some of them must be floating around freely now.

The JBL PROCRISTAL UV-C Compact plus can also kill off cyanobacteria floating freely in the water.

Can I store my water tests near a UV-C device?

Storing water tests near a UV-C unit will not cause any problems.

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.

Does UV-C 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 dosage. At the beginning simply convert the standard dosage (of e.g. JBL PROFLORA Ferropol 24) into a daily dose. It may be necessary to increase the fertiliser dosage. Before each fertiliser application iron needs to be measurable at least in traces. Vitamins and other superior organic compounds are also degraded in this process.Therefore we advise you add a dose of vitamins to the food (e.g. with JBL Atvitol) twice a week.

How much electricity does a JBL ProCristal UV-C 5 W - 36 W 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.

Enclosed with my ProCristal UV-C are several seals. Which should I use?

For each connection fitting there is a seal in the carton and another fitting for the special elbow fitting. Thus for the 5 W and 11 W version 3 seals and for the 18 W and 36 W version five seals are enclosed. All the seals in the carton are the same size. Never use two on top of each other since this can lead to leakage. Please only use one seal for each connection.

If I want to add live bacteria to my aquarium, do I need to switch off the UV-C device?

Yes, this would be useful. The bacteria, as for example in JBL Denitrol or JBL PROCLEAN BAC, 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 device for a day.

In the instruction manual illustration for the JBL PROCRISTAL UV-C, the UV-C device is pictured connected behind the filter in an aquarium, yet it is pictured in front of the filter unit in the pond. Why is that?

A UV-C device 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 canister is higher than the pond water level and the water flows out of the filter then flows freely downwards back 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 keep backwater out of the UV-C device.

What helps with green water in the aquarium?

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 options:

1. Carry out significantly more water changes in order to remove the nutrients caused by fish excrement.

2. A JBL PROCRISTAL UV-C Compact plus 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.

Green water in the pond? JBL's PROCRISTAL UV-C helps - guaranteed

Unsightly and opaque green water colour in the pond (rarely in the aquarium) is caused by microscopic floating algae. There are two ways to combat these algae:

Find out more

JBL TV #49: Saving energy in the aquarium - reducing costs made easy

Yes, we can make energy savings in our aquarium, but not where most people think! In this video we show exactly where and how to save electricity costs.

Find out more

JBL TV #46: Clear view in the aquarium - Getting cloudy water clear

Biologist Heiko Blessin explains the causes of cloudy aquarium water and the ways to get it crystal clear again.

Find out more

Video: Replacing the UV lamp - Maintaining clear water in the pond and aquarium

With the help of a UV-C lamp, the water in the aquarium and pond becomes crystal clear and any cloudiness is eliminated within 24 hours. We will show you how easy it is to replace a UV-C burner.

Find out more

JBL TV #23: Cloudy water in the aquarium? These measures will help!

We’ll go through all the different types of cloudiness and discolouration, explaining how to treat each one.

Find out more

Video: How do you install a UV-C water clarifier?

We will show you how easy it is to assemble a UV-C water clarifier.

Find out more

The cold weather’s here: get your pond ready

Here you’ll find everything you’ll need to know to keep your fish healthy during the winter and to give them a good start into the next season.

Find out more

I’ve had enough of this pond! Give up or save it?

Maybe you’ve felt like this: nothing works, the pond looks disastrous and you just don’t know what to do.

Find out more

Let’s Clear This Up: Cloudy Water in the Pond

Clear water is right at the top of almost all pond owners’ wish list.

Find out more

The Indispensible Partner for a Good Pond Filter

In my opinion, a UV clarifier is an indispensible partner for a good pond filter. Unfortunately I am often confronted with dangerous half truths about this subject. First of all we need to say that the operating principle is the same or similar for every make.

Find out more

A Good Start to the Garden Pond Season

The temperatures are slowly beginning to rise again and the nights are nearly frost-free. This is the right time to carry out a quick check in our garden shed.

Find out more

17.07.2024

JBL tests UV stability of fertilisers

The combination of aquatic plant fertilisers and UV-C water clarifiers can create problems for aquarium enthusiasts: the UV-C radiation (200-280 nm wavelength) unfortunately destroys vitamins and plant fertilisers.

Find out more

19.10.2023

Did you know that UV-C water clarifiers can get limescale and then stop working?

If you’ve ever opened your UV-C water clarifier to find out why its effectiveness has diminished so much, you were probably surprised to find the glass tube around the UV-C bulb completely covered in a layer of limescale.

Find out more

Instructions

JBL PROCRISTAL UV-C Compact plus 18 W
Download

safety instructions

safety instruction for technical devices
- Filename:
  
  JBL_Sicherheitshinweis_fuer_Technische_Geraete.pdf
Download

Reviews

Overall rating: 4.9

8 public review(s) for this product.

0 Reviews

8 more reviews in other languages

8 Reviews in other languages

D. Langenfeld - German

2024-04-15T14:38:20Z

Einfache Montage und tut was es soll! Kompaktes Maß!!

Alexander Paulus - German

2023-11-17T08:18:29Z

Sehr kompakt und super power!

Bin sehr zufrieden!

K. Buchgeister - German

2023-07-09T17:41:01Z

Sehr begeistert!

Dieser UVC- Klärer macht genau das was er soll.

Mein Algenproblem hat sich in Luft aufgelöst und die Wasserqualität ist deutlich besser/ stabiler geworden.

Meine Diskus stehen seither deutlich besser da!

Ich werde nichtmehr auf den UVC- Klärer verzichten wollen

und obendrein spart man noch an Heizkosten ✅

german_monstertank - German

2023-04-13T19:47:36Z

Tobis Aquaristikexzesse - German

2022-10-31T09:04:25Z

Sehr guter UVC Klärer.

einfache Handhabung und Wechsel der Lampe schnell und unkompliziert. Ebenfalls ist es möglich durch ein Verbindungsstück nach bleiben mehrere UVC Klärer zu koppeln ,oder hintereinander in einen Filterkreislauf anzuschließen. Ebenfalls sind unterschiedliche Aufsätze erhalten die den Anschluss an unterschiedliche Filter- bzw. Schlauchgrößen ermöglichen, so kann der UVC Klärer auch bei Wechsel der Filter, oder Aquariengröße weiter benutzt werden.

Ein Stern Abzug da die Dichtungsringe gerne mal verrutschen und man bei Erstbetriebnahme hier kontrollieren muss das es nicht irgendwo tropft. Die neuen Dichtungsringe sind besser und verrutschen nicht so leicht.

Dichtungsringe direkt in den Schraubverbindungen wären mir lieber.

aquascaping.tv - German

2021-07-08T16:30:25Z

Lampa spełnia swoja role. Należy jednak poświecić uwagę dokładnemu montażowi i zwróceniu większej uwagi na uszczelki. Należy po prostu zrobić to należycie. Polecam.

andres.reef - German

2021-04-20T17:12:04Z

Top UVC Anlage.

Universal einsetzbar sowohl im Meerwasser, Süßwasser und im Teich.

Die Anlage ist bei Bedarf erweiterbar, sehr cool ist das Winkelstück um die Anlage im Unterschrank platzsparend unterzubringen.

Die Kabellänge beträgt 2 Meter, dies ist in der Regel innerhalb der Aquaristik mehr als ausreichend.

Ich selbst nutze es im Meerwasser Bereich und kann das Gerät ohne Bedenken weiterempfehlen !

diskusmummy - German

2021-03-16T07:22:55Z

Ich habe den Cristal UV-C 18 Watt (250 Liter) und den großen Bruder mit 36 Watt (1000 Liter) im Einsatz. Beide laufen im Bypass meiner CristalProfi Filter zur Entkeimung mit. Ich mache regelmäßig Keimtests, um das Wasser zu überprüfen. Die Keimbelastung liegt bei10²KBE/ml - das ist ein super Ergebnis. Meine Diskusfische und ich werden nicht mehr drauf verzichten. Einziges Manko, die Brenner müssen regelmäßig getauscht werden. So what.

Kleiner Tipp: Man spart durch den UV-C Klärer auch an Heizleistung ;-)

A word about cookies before we continue

The JBL Homepage also uses several types of cookies to provide you with full functionality and many services: We require technical and functional cookies to ensure that everything works when you visit this website. We also use cookies for marketing purposes. This ensures that we recognise you when you visit our extensive site again, that we can measure the success of our campaigns and that the personalisation cookies allow us to address you individually and directly, adapted to your needs - even outside our website. You can determine at any time - even at a later date - which cookies you allow and which you do not allow (more on this under "Change settings").

The JBL website uses several types of cookies to provide you with full functionality and many services: Technical and functional cookies are absolutely necessary so that everything works when you visit this website. In addition, we use cookies for marketing purposes. You can determine at any time - even at a later date - which cookies you allow and which you do not (more on this under "Change settings").

Our data protection declaration tells you how we process personal data and what purposes we use the data processing for. tells you how we process personal data and what purposes we use the data processing for. Please confirm the use of all cookies by clicking "Accept" - and you're on your way.

Are you over 16 years old? Then confirm the use of all cookies with "Noticed" and you are ready to go.

Change settings

Only absolutely necessary

Allow all

Choose your cookie settings

Technical and functional cookies, so that everything works when you visit our website.

Marketing cookies, so that we recognize you on our pages and can measure the success of our campaigns.

I accept the YouTube Terms of Service and confirm that I have read and understood the YouTube Terms of Service .

Cancel Save

Animal species:	Arowana, Axolotl, Barbels, Bettas, Bichirs/reedfish, Blowfish, Catfish, Cichlids (South America), Corals, Crayfish, Danions, Discus, Dwarf crayfish, Dwarf shrimps, Flowerhorn, Gobies, Goldfish, Gouramis, Guppy, Juvenile fish, Killifish, Koi, Livebearers, Loaches, Mussels, Newts, Panchaxes, Rainbowfish, Snails, Spiny eels, Sturgeons, Tetra, Veiltails, freshwater butterflyfish
Animal size:	For all animal sizes
Material:	Plastic/glass/copper
Colour:	grey / black

power output in Watt:	18 W
Height:	141 mm
Length:	442 mm
Width:	246 mm
voltage:	240 V

Mercury:	No
Dimmable:	No

Products & Shop

JBL PROCRISTAL UV-C Compact plus 18 W Compact UV-C water clarifier 18 W against water cloudiness

You may also be interested in

PROCRISTAL UV-C Compact plus 5 W

PROCRISTAL UV-C Compact plus 11 W

PROCRISTAL UV-C Compact plus 36 W

JBL PROCRISTAL UV-C Compact plus 18 W

Properties

Electronic label / illuminant

Technical Data

Green water in the pond? JBL's PROCRISTAL UV-C helps - guaranteed

JBL TV #49: Saving energy in the aquarium - reducing costs made easy

JBL TV #46: Clear view in the aquarium - Getting cloudy water clear

Video: Replacing the UV lamp - Maintaining clear water in the pond and aquarium

JBL TV #23: Cloudy water in the aquarium? These measures will help!

Video: How do you install a UV-C water clarifier?

The cold weather’s here: get your pond ready

I’ve had enough of this pond! Give up or save it?

Let’s Clear This Up: Cloudy Water in the Pond

The Indispensible Partner for a Good Pond Filter

A Good Start to the Garden Pond Season

JBL tests UV stability of fertilisers

Did you know that UV-C water clarifiers can get limescale and then stop working?

Instructions

JBL PROCRISTAL UV-C Compact plus 18 W

safety instructions

safety instruction for technical devices

PC UV-C Compact plus electrical unit

PC UV-C 5,11,18,36 W gasket set

PC UV-C bulb protection kit

PC UV-C quartz glass cylinder set

PC UV-C glass sleeve + reflector set

PC UV-C hose connection gaskets

PC UV-C hose connection set

PC UV-C Compact plus casing kit

Replacement lamp UV-C

adapter UK for all circular plugs

ProFlow t300

ProFlow t500

ProFlow u800

ProFlow u1100

PF "u" cover + hose connection

PC UV-C 5,11,18,36 W mounting

PROCRISTAL UV-C QuickConnect

PROCRISTAL UV-C ElbowConnect

double stopcock+quick coupling

Reviews

0 Reviews

8 Reviews in other languages

A word about cookies before we continue

Choose your cookie settings

JBL PROCRISTAL UV-C Compact plus 18 W
Compact UV-C water clarifier 18 W against water cloudiness