Filtration, perfected


With AFMng®, increased biosecurity and increased organics removal mean more efficient systems and reduced oxidation demand

Dryden Aqua’s AFM® media has been used in a variety of aquaculture applications, such as intake water systems, hatcheries, brood stock and wastewater treatment, for over 20 years.

AFM®ng, Dryden Aqua’s new hydrophobic media delivers 95% removal of 1 micron particles and offers improved organics, microplastics, lipids and fats removal, as well as improved performance in soft water, whilst maintaining its resistance to biological fouling. This makes it ideally suited for use in any aquaculture application.

Clean water

Current typical RAS designs are not effective in removing particles sized <30-50 microns in drum filters and >10 micron particles in protein skimmers, leaving those in the range between 10 and 50 microns to be carried into the biological filters. The actual purpose of the latter is nitrification, so their performance is compromised by organic particulates while sludge production is increased. Some other, smaller particles continue to circulate throughout the system increasing the overall load until the systems finally crash.

Sludge production increases the foot print of the biological filter, whilst also increasing oxygen demand, pH regulation and risk of pathogens. The cost of sludge disposal is also increasing incrementally.

Organics removal is where AFM® starts to make a large impact. There are a number of farms running side loop systems on Grow-Out RAS (10, 20 and 50% flows) as they see the value in greatly reduced organics loads impacting on the biological filter’s performance and the benefits in oxygen savings as a result of the reduced load.

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Fish Farmer magazine June 2024 cover

The June 2024 issue of Fish Farmer magazine is out now online