JBL SilicatEx Rapid
Prevents diatoms by removing silicate

  • Filter material for the removal of silicic acid (silicate) in fresh and marine water to prevent diatoms
  • Rinse, fill in filter bag (enclosed) and place in filter. Rinse after one to two weeks
  • Diatoms can form brown unsightly deposits on gravel, decoration material and plants
  • Silicate content can be checked with silicate test. Result: values below 0.4 mg/l silicate prevent diatoms
  • Guaranteed efficiency: binds up to 30,000 mg silicate (SiO2)/ kg. Including net bag and sealing clip
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Price: 29,40 €
basic price 73.5 EUR / kg
Recommended retail price incl. VAT
You can find this item in your specialist and online shop
Product information

This is how to have a beautiful aquarium without troublesome algae

Diatoms form brownish coatings on plants, aquarium base and decorations. They occur when your water contains more than 0.4 mg/l silicic acid/silicates (SiO2). The silicic acid mainly comes from your tap water. It serves to develop the skeletal structure of the diatoms. To combat the algae, just remove the silicic acid from the water and they will die or have no opportunity to form.

Diatoms are neither toxic nor harmful. They even form a part of the nutritional basis for grazing cichlids in Lake Malawi and Lake Tanganyika. But as algae form brownish coatings which are regarded as unattractive we tend to remove them from our aquariums.

Distinguishing between diatoms and slimy algae
Both algal groups can look very similar. But when you take them between your fingers you can feel the difference: slimy algae feel greasy-slimy even after rubbing them longer, whereas diatoms feel rough.

Special filtering
SilikatEx removes silicate from fresh and marine water aquariums. It removes from the main nutrients the unwanted diatom algae (brown coatings), which often appear after freshwater has been added. SilikatEx Rapid also removes phosphate etc. and thus curbs the growth of other algae. The filter material creates biotope-like living conditions.


JBL SilicatEx rapid

Art. no.:
EAN Code:
400 g
90-300 l
Volume packaging:
1.05 l
Gross weight:
440 g
Net weight:
400 g
Weight factor:
Packaging dimensions (l/h/w):
43/225/125 mm


Animal species: Armored catfish, Arowana, Axolotl, Barbels, Bettas, Bichirs/reedfish, Blowfish, Catfish, Cichlids (South America), Clawed frogs, Clawed shrimps, Corals, Crayfish, Crustaceans, Danions, Discus, Dwarf crayfish, Dwarf shrimps, Flowerhorn, Gill maggots, Gobies, Goldfish, Gouramis, Guppy, Juvenile fish, Killifish, Livebearers, Loaches, Mussels, Newts, Panchaxes, Rainbowfish, Snails, Spiny eels, Terrapins, Tetra, Tropical terrapin, Veiltails, Water turtles, blood parrot cichlids, freshwater butterflyfish
Animal size: For all animal sizes
Animal age group: All aquarium fish
Volume habitat: 90-300 L (80-120cm)
Material: iron oxide hydroxide
Colour: red / brown
Dosage: 400g per 200-400 l

Electronic label / illuminant

Mercury: No
Dimmable: No

Technical Data

Height:190 mm
Length:125 mm
Width:45 mm
Does Silikat Ex raise the general hardness ?

When the silicate values are high, the measurable general hardness may in fact rise after Silikat Ex is used. This can be explained by the “masking” of the hardness-producing substances, calcium and magnesium, as a result of the silicates in the water.

How much silicate can be bound with one pack (400g) SilikatEx Rapid?

One pack (400g) can bind approx. 12,000 mg silicate.

Does JBL SilikatEx have any effect on the carbonate hardness and/or the pH value?

Yes, especially in cases of overdoses JBL SilikatEx can reduce the carbonate hardness and thus indirectly the pH value.

This is especially relevant for aquariums with soft starting water and with marine aquariums. In such cases we recommend a parallel control of the carbonate hardness and if necessary also the addition of JBL AquaDur or JBL AquaDur Malawi/Tanganjika (both for freshwater).

Can I use JBL SilicatEX in the drinking water of the bathing tubs, too? Does this material release any substances into the water?? Could these be harmful to my lizards?

The raw ingredient in SilicatEx is normally used to remove arsenic from drinking water on a large scale in waterworks. Therefore, it can be assumed that there is no risk in this respect.

How long does JBL SilicatEx keep for?

JBL SilicatEx has an unlimited storage life in dry conditions.

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Blog (opinions & experiences)

Special case diatoms - What’s important?

All algae (except blue-green algae, which are actually not algae but cyanobacteria), are exacerbated by high nitrate (NO3) and phosphate (PO4) levels. Diatoms are an exception to this.

Find out more

BL TV 40: Selection of filter material for the aquarium - Biological. Mechanical. Troubleshooter.

Why are there different types of activated carbon? What is sintered glass filter material and where in the filter do you place the dedicated filter materials?

Find out more

What's going on in the filter - How murder and bacteria make the water clear

The aquarist isn’t even aware he has committed mass murder by his well-intentioned addition of salt and now a tidal wave of problems is heading his way.

Find out more

JBL TV #28 Part 4: Aquarium care is so easy! Monthly tasks.

How to care for your aquarium properly: What do you need to do every month?

Find out more

Getting rid of diatoms - no problem at all

If a brown coating covers the substrate of your aquarium and looks unattractive, let’s hope it is diatoms! The alternative would be smear algae - and they are not as easy to get rid of as diatoms.

Find out more

Outline: Fertilisation in the Aquarium

The JBL plant care concept leads to vigorous and healthy growth even with the most demanding aquatic plants. JBL has all the components you need, whether it’s a fertiliser, a bottom substrate or a fully automatic CO2 fertiliser system.

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Which is the Best Filter Media?

Special filter media can also be used to target and remove any problem substances, such as nitrate or phosphate, from the aquarium water. This table gives you an outline:

Find out more

Keeping an eye on the most important water values

Professional water analysis sounds very expensive. But the professional water testing in your aquarium or pond at home also works on a high level and above all it is simple and inexpensive.

Find out more

Water values for water plants in detail

If we transfer this Liebig’s Law of the Minimum to the aquatic field it quickly becomes clear how important balanced fertilisation is for plant aquariums.

Find out more


Enforced fasting is the best solution

Withdrawing food is the best way to combat algae! A good silicate eliminator quickly, reliably and easily prevents those unsightly brown coatings which often cover the substrate, stones, wood and even plants in the aquarium.

Find out more
Laboratories and calculators

Water Analysis Online Laboratory

Enter your water parameters and get an in-depth analysis of your values in a matter of seconds. You enter your water values – and we analyse! Here you have the opportunity to enter the measured water values directly into the JBL Online Laboratory. This will analyse your values and explain and submit corrective measures.
Reference guide (Themeworld)

Marine water

There is a solution to almost every problem! And the hardest part is finding the cause of the problem.

Filter material as troubleshooter

Which filter media combats which problems? What you need to optimise water values?

Reducing problematic water values

How to lower critical water values.

Algae control

Here’s how to combat algae successfully and lastingly.

Daily care

How much daily or weekly care is involved? What are the basic maintenance measures for your aquarium?

Water values

Which water tests are important? How can you achieve perfect water values?

The right filter material

What sort of filter material to choose? What filter material solves which problems? How can you clean it? Where does it need to be positioned in the filter?

Aquarium filters and aquarium accessories

Why is a filter important? What function does your filter have? What do you have to look out for when choosing a filter? What types of filter are available?

The marine aquarium

Holiday at the coral reef - in your own living room! Marine aquariums are the most exciting branch of aquatics

Biotope (habitat) aquarium types

A real piece of the Amazon or, with the Congo, a piece of the heart of Africa. A habitat (biotope) aquarium is a challenge. Can you emulate nature?

Jungle aquarium type JBL Rio Pantanal®

A bit of jungle river in your living room. Lively underwater action! No problem with the JBL Rio Pantanal® aquarium

Rocky reef aquarium type JBL Malawi Rocks®

The fish of Lake Malawi are as colourful as the fish in the coral reefs. This aquarium brings a bit of freshwater reef into your living room

Goldfish aquarium type JBL Goldfish Paradise®

Lively goldfish in the aquarium enhance any room perfectly! Invite some new flatmates into your home with this goldfish aquarium.

Aquascaping aquarium type JBL Dreamscape®

Mountains, valleys, meadows and fish! Create your dreamlike landscape under water with the Dreamscape® aquarium


safety instructions

  • safety instruction for water conditioners
    • Filename:
Customer reviews


Overall rating: 4.9
7 public review(s) for this product.

1 Review


This is a great product , absolutely necessary in case you have an excess of silicates in your tank! I was having some algae issues, probably due to the limestones that i have used in the hardscape. This product , turned out to be the solution to my problem...

6 more reviews in other languages

6 Reviews in other languages

F. Carroll - German

Bin damit sehr zufrieden. Zieht Silikat in kurzer Zeit aus dem Becken. Ich empfehle nur beim auswaschen Handschuhe zu tragen,da es doch sehr stark abfärbt und man orangene Finger danach hat ;)

marcs.jungle - German

Ich bin begeistert :)

Anfangs hatte ich einen Silikatwert von über 6, mittlerweile ist er bei 1,2. Das Filtermaterial wirkt also! Einmal alle 1-2 Wochen auswaschen nicht vergessen!

G.E.P.P. - French

Je l'utilise avec un filtre externe JBL CRISTAL PROFI e402 pour éliminer les silicates et limiter l'apparition des diatomées.


A. Lübke - German

Entfernt zuverlässig Silikat aus dem Aquarienwasser.

Als Langfristige Lösung bei stark belastetem Ausgangswasser allerdings doch ein teures Unterfangen. Da lohnt sich - je nach Beckengröße - durchaus die Anschaffung einer Osmoseanlage, die dem Leitungswasser sehr wohl den größten Teil an Silikat entzieht. Sollte der durchgelassene Silikatgehalt zu hoch sein, kann man spezielle Reinstwasserfilter nachschalten.

tropheus_italia - Italian

Usati nel mio acquario devo dire che in pochino tempo hanno ridotto i silicati in acquario li consiglio a tutti sono un ottimo prodotto!

german_monstertank - German

Definitiv ein wichtiges und gutes Produkt Silikat braucht man Definitiv nicht im Aquarium - und auch eine Osmose Anlage filtert das nicht raus

Ich habe keine fahre darum super mit dem Silikat ex !👍

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