Aquarium Pharmaceuticals FilStar Bio-Chem Zorb

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This item has been discontinued.

Aquarium Pharmaceuticals, API, MARS Fishcare

Canister filter media designed to fit the FilStar XP. The ultimate media for the removal of organic waste from fresh and saltwater.

Bio-Chem® Zorb - for fresh and salt water:

  • Removes dissolved organic waste
  • Makes water crystal clear by removing aquarium pollutants that cause discoloration and foul odors
  • Removes toxic heavy metals in fresh water
  • Does not remove trace elements from saltwater aquariums
Bio-Chem Zorb is composed of two organic scavenger resins and two ion-exchange resins, combined with a high-porosity activated carbon. Together, they remove synthetic chemicals, naturally occurring organic pollutants and metabolic by-products from aquarium water. Bio-Chem Zorb filters water to a level not achievable with carbon alone.

Organic Pollutants in the Aquarium: Bacterial decomposition of dead fish and plants, uneaten fish food and solid waste from fish and invertebrates creates organic pollutants in the aquarium. In nature, water currents and tides carry these pollutants away. Aquarium water, however, is changed only periodically. In between changes, organic pollutants can accumulate to harmful levels.

Effect of Accumulated Organic Pollutants in the Aquarium:
  • The accumulation of organic pollutants creates a stressful environment and provides a breeding ground for fish pathogens. Some naturally occurring bacteria break down certain organic pollutants. However, this action is often incomplete in an aquarium and uses up oxygen, reducing the amount of oxygen available for fish, invertebrates and the biological filter.
  • Poor water quality ultimately causes suppression of the immune system, leading to disease outbreaks and inhibiting the growth and reproduction of fish and invertebrates. The accumulation of organic pollutants also leads to negative effects such as decreased pH, discolored water, reduced light transmittance and foul odors.
  • Bio-Chem Zorb cleans aquarium water through ion exchange, adsorption and absorption processes. Organic pollutants, toxic heavy metals and aquarium medications are efficiently "sorbed" by organic scavenger resins and high-porosity activated carbon in Bio-Chem Zorb.
Using Bio-Chem Zorb In Salt Water: Bio-Chem Zorb is especially useful in removing refractory organics or "yellow water" that form when organic pollutants are not biodegraded. These organic pollutants can reduce the transmittance of light energy necessary for many saltwater invertebrates. With Bio-Chem Zorb, a high redox potential will be easier to maintain. Bio-Chem Zorb is also very effective for removing aquarium medications and treatments.

Directions for use in RENA® FilStar Filters:
  • Remove Bio-Chem Zorb filter pouch from plastic bag.
  • DO NOT open Bio-Chem Zorb filter pouch. One 283 g pouch should be used for every 55 U.S. gallons (208 L) of aquarium water.
  • It is important to rinse filter pouch of Bio-Chem Zorb under tap water to remove any dust. The rinse water does not have to run completely clear.
  • Place filter pouch directly in FilStar filtration basket after (above) filter foams.
  • Replace filter pouch every 1 to 3 months, depending on stocking density and water quality.
Use Aquarium Pharmaceuticals Test Kits to monitor water quality weekly. Bio-Chem Zorb is designed for use with all FilStar filtration media.

Product Manuals & Documentation

Aquarium Pharmaceuticals FilStar Bio-Chem Zorb

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

Aquarium Pharmaceuticals Aquarium Supplies
Aquarium Pharmaceuticals (API) has been helping people take good care of ornamental fish for over 40 years. Their research and development scientists have advanced the care of fish with all-natural medications, stable bacteria for biological filtration, one-bottle test kits, consumer-friendly dosing caps and much more. They’ve received over 25 global patents for their breakthrough innovations in the aquatics industry. And they continue to look for ways to improve the fishkeeping experience for hobbyists. Research. Experience. Dedication to scientific, quality treatment for healthy fish. It’s what makes API the first choice of aquarium owners. API manufactures and sells hundreds of products across many different product categories, including aquarium and pond treatments, aquarium equipment, aquariums and fish nutrition.



Experience Level: Intermediate


Just like the video from API from mars co. It will get the job done. Thank you for your helpful staff & prices.

1 out of 1 found this review helpful

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MARK from


Experience Level: Intermediate

Aquarium Pharmaceuticals FilSt

Good product. Easy to use.

1 out of 1 found this review helpful

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Experience Level: Expert


works great when water is clear. does not work when water is cloudy, or high levels of ammonia.

3 out of 9 found this review helpful

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Experience Level: Expert

bio-chem zorb

doesnt help that much.

0 out of 3 found this review helpful

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Experience Level: Intermediate

Bio Chem Zorb

This product is fantastic. Its very easy to use and it works great. All three of my saltwater tanks use the Rena systems and all have the bio chem zorb filtters. Ever since I started using this product all my tanks are crystal clear. I love this product and I highly recommend for anyone who keeps saltwater aquariums.

11 out of 11 found this review helpful

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