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Korallin Sulfur-Based Biodenitrator

Korallin Sulfur-Based Biodenitrator S-1502 Korallin BioDenitrator S-1502, S-3002 & S-4002
  • Large internal volume with a small footprint
  • Optimal efficiency through high internal recirculation and fast Nitrate removal
  • Top-loading lid with detachable tubes for easy maintenance
  • No feeding liquid required!
  • Ultra-pure Sulfur (Sulphur) filling 99.9%
  • For fresh and saltwater use
This revolutionary design makes denitrifaction easy and efficient. Feeding to the bacteria is not necessary; just put the unit into your system and let it run for a few weeks, denitrafication power will be activated once the unit is broken in.

The design is based around the C-1502 reactor and combine Sulfur (Sulphur) media with calcareous media to offer a high level of Nitrate removal. The recirculation method is far more efficient than simple single pass filters. As it includes reactor media, the pH is fully buffered and enriched with calcium before being returned to the tank.

With the build quality of the C-1502 reactor and recirculation, these offer very efficient nitrate removal. After a running in time of approximately 3-4 weeks (for the bacteria to colonize the chamber) this unit will, for example, reduce 100 liters with 50mg NO3 to 0 in 3-4 days.

Because this denitrator makes use of the design of Calcium Reactor C-1502, once the nitrate problem has been solved, you can easily turn this denitrator into a Calcium Reactor with some additional parts (sold separately). Comes with high grade pure Sulfur (Sulphur) and crush-coral substrate.


More Info:

The Use of Sulfur (Sulphur) Denitrators
Over the last few years' Sulfur (Sulphur) denitrators have grown in popularity in Europe from humble beginnings in public aquaria to being used in cutting edge integrated filter systems.

Existing Methods
Before we recommend a new process to customers, we make sure we have tested them ourselves on our own systems. We have long held the view that if you design a natural system with the management of nutrients in mind, nitrate and phosphate can be almost forgotten. But with all the best laid plans, you often end up with excess nutrients. These may be due to a higher load of fish or inefficiency in the system’s denitrification abilities. Either way; even the best systems can end up with a nagging 10-20ppm of residue nitrate. The options currently available to resolve excess nitrate would normally take the route of increasing water changes, adding more live rock, or increasing things like the deep sand beds or adding mangroves.

An option that many people have tried is the slow flow denitrator. These rely on anaerobic bacteria, colonising a suitable medium and the flow of water being slow enough, to become depleted of oxygen to create an environment they can thrive in. These bacteria will then multiply and consume the nitrate in the low oxygen water. If well set-up this method can be quite successful.

Enter Sulfur (Sulphur) Denitrators
Guy Martin from Ecole Nationale Supérieure de Rennes did the original work on fresh water treatments plants, although the science may pre-date this. The work was transferred to the marine environment and used by Michel Hignette, curator of the MAAO aquarium. A pilot project was launched. Since then the experiment was done on a much bigger scale, at the MAAO, as well as in the Grand Aquarium in Saint-Malo. All of these systems have been a great success and the systems have proved a real boon in large scale aquariums where the management of nitrate is often an after thought, when feeding displays stocked with large fish with voracious appetites. After these successes, there have been many Sulfur (Sulphur) denitrators added to private aquariums across the continent.
  • Simple to set-up and manage.
  • Needs no additional feeding with carbon based foods.
  • Works well without the cost of additional electronic control.
  • Will supply additional calcium to the tank when used as per instructions.
  • Units can be ran in series for management of higher nitrate levels.
  • Long lasting: up to 2-3 years.
  • Units can be easily refilled.
Click here to see Installation Diagram 1
Click here to see Installation Diagram 2
Korallin Sulfur-Based Biodenitrator - Top
ModelCapacityHeight (Approx)DiameterFootprint DiameterIncluded Filter Media†Pump
S-1502up to 250gal15.75"4.5"6.3"6lbsEheim 1048
S-3002up to 400gal28"4.5"6.3"12lbsEheim 1048
S-4002up to 700gal24"6.3"7.5"20lbsEheim 1250
† - High grade pure sulphur and crush-coral substrate.
Item #DescriptionPrice 
KL9111KKorallin BioDenitrator Nitrate Filter S-1502 w/ Eheim 1048 Pump$390.49
KL9113KKorallin BioDenitrator Nitrate Filter S-3002 w/ Eheim 1048 Pump$505.49
KL9115KKorallin BioDenitrator Nitrate Filter S-4002 w/ Eheim 1250 Pump$727.99
KL31151Korallin S-1502 to C-1502 Conversion Kit$141.49

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