Great Aquariums Start Here
Live Chat Support
    Free Shipping
  • FREE Shipping ON $75+
  • 14-Day Low Price Guarantee
  • Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
99% of items we carry qualify for FREE SHIPPING in the contiguous United States if you spend $75 or more. Learn More
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us. Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 2 pm EST ship the same day! Learn More
Home » Saltwater Aquarium Supplies  » Filters  » Inline & Specialty Filters  » Bio Denitrators  »  Korallin BioDenitrator w/o Pump
Korallin BioDenitrator w/o Pump

Korallin BioDenitrator w/o Pump

Average Rating 5 5
Write A Review
Product Review
We value your opinion & experience
Thank you for taking the time to review our products!

This is a Product Review for: Korallin BioDenitrator w/o Pump
Name to display on the review:
Location (ex: Anaheim, CA):
Your experience level:
How would you rate this product?
Review Title:
Write your review:
(Please focus on product quality and performance)
Item #:
Please make a selection
From $363.49
Notify Me
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
Add to Cart or Notify Me
This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.
Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

+ Add to Wishlist
Add to Wishlist
Select Wish List:
Comments (up to 200 characters):
Quantity Desired:
Quantity Received:
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us.

Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions.
Shipping Cost*
Competitor's Website*
*Required information
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

Korallin BioDenitrator w/o Pump Information

Product Manuals & Documentation

*Eheim 1048 pump required and sold separately

  • 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%
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 S-1501 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 C1502, 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 1.6kg high grade pure Sulfur (Sulphur) and crush-coral substrate.

Korallin S-1502 - Rated for up to 250 gal. Reactor height: approx. 15.75"; Diameter: 4.50"; Footprint diameter: 6.30"; Included filter media: 6lbs 

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.

Manufacturer Info

Korallin is a German based company who is a manufacturer of specialized aquatic components and accessories for the advanced marine aquarist.

Korallin BioDenitrator w/o Pump Reviews

Average Rating
(5 reviews)
Sort Reviews By:

Now you can sleep at night!

Reviewers Rating Excellent!

Posted: 1/19/2013 from Los Angeles, CA UNITED STATES
5.0 5
Experience Level: Expert

Comments: I've been using this denitrator for 4 years now on 200 to 30 gallon reef tanks, and my nitrate levels have remained at zero! Along with regualar cleaning and water changes this has been one of the best purchases i have ever made, other than my controller.

2 of 2 People found this review helpful, did you? Yes No


Reviewers Rating Excellent!

Posted: 7/30/2009 from PEMBROKE PINES, FL UNITED STAT
5.0 5
Experience Level: Intermediate

Comments: this is a very good denitrator... it start to work fast... in just 2 week the nitrates when down to 10% then to zero nitrates there's only few things left in the instruction paper..need more detailing ,or photos

7 of 10 People found this review helpful, did you? Yes No

Million dollar piece

Reviewers Rating Excellent!

Posted: 6/17/2009 from CONROE, TX UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: instructions were lacking but the results are speechless! before setup,nitrates were on a constant 80+ppm even after water changes on a 125gal fish and reef tank.after 1 week the output was reading 0ppm and in 2weeks,aquarium nitrates dropped at 40,within 4weeks at 10.i also added more corals and fish.this product is a must and i suggest gettin one.maintain waterchanges and proper water chemistry for a healthy saltwater tank.

4 of 4 People found this review helpful, did you? Yes No

Best investment

Reviewers Rating Excellent!

Posted: 3/27/2008 from LAUREL, MD UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I have a 265 gallon reeftank which is loaded with coral and large fish. I battled high nitrates for years until I purchased this product. My nitrates were typically between 30 and 40ppm. Three weeks after installing this product, my nitrates have plummeted and have remained at zero. My corals have never looked so good and my calcium levels are fine. Buy one of these before you buy a calcium reactor which it can be converted to. This was the single best investment for my reeftank.

7 of 7 People found this review helpful, did you? Yes No

Korallin BioDenitrator

Reviewers Rating Excellent!

5.0 5

Comments: I have a 72 gallon tank heavily loaded with corals and fish. I could not get the nitrates under 40-50 other than massive water changes. I installed this unit and after 5 weeks nitrate are 10.

6 of 6 People found this review helpful, did you? Yes No

Please make a selection 
WIN A MEDIA REACTOR! Sign up for hot deals, helpful videos, and a chance to win an Accel Aquatics FR-30 Media Reactor!