Marine Aquarium Filter Media, Activated Carbon & Phosphate Removers
Keep your marine and reef aquarium water clean, clear and balanced with our range of aquarium filter media and nutrient removers.
Shop activated carbon, phosphate and nitrate removers, biological filtration media, filter wool and media bags from leading brands including Red Sea, Fauna Marin, Nyos, D-D, Maxspect and Polyplab.
Whether you're improving water clarity, controlling excess nutrients or maintaining your aquarium filtration system, discover reliable solutions at Rock ’N’ Critters.
Browse all of our aquarium filter media & removers below:
Marine Aquarium Filter Media & Nutrient Removers
Effective Filtration for Healthy Reef Aquariums
Maintaining excellent water quality is essential for a thriving marine or reef aquarium. At Rock ’N’ Critters, we stock a comprehensive range of aquarium filter media, activated carbon, phosphate removers and biological filtration products to help keep your aquarium water clean, clear and balanced.
Whether you're managing excess nutrients, removing dissolved organic waste or improving mechanical filtration, our range includes trusted products from Red Sea, Fauna Marin, Nyos, D-D, Maxspect, Polyplab and more.
Activated Carbon – Crystal-Clear Aquarium Water
Activated carbon helps remove dissolved organic pollutants, yellowing compounds, odours and certain chemical residues, improving water clarity.
Discover premium options including Red Sea REEF-SPEC Carbon, Nyos Active Carb and Fauna Marin Carb L, ideal for routine chemical filtration in marine and reef aquariums.
Phosphate Removers – Control Unwanted Nutrients
Excess phosphate can contribute to nuisance algae and affect coral calcification. Our phosphate-removing media help aquarists manage phosphate concentrations through controlled adsorption or chemical treatment.
Choose from Fauna Marin Phos 0.04, Power Phos, Nyos Phosi-Ex, Maxspect PhosPhree and Blue Life Phosphate Rx.
Always monitor phosphate levels and avoid excessively rapid reductions.
Biological Filtration & Nitrate Control
Beneficial bacteria play an important role in processing aquarium waste and maintaining biological stability.
Our range includes Polyplab Genesis Rock for bacterial colonisation and biopellet media such as Tropic Marin NP-Bacto-Pellets and iQuatics Marine Bio Pearls for biological nutrient management.
Mechanical Filtration & Media Accessories
Remove suspended debris and keep filtration equipment organised with HOBBY Aqualon Filter Wool, D-D Media Bags and Aqua Medic Filter Bags.
These practical accessories help maintain efficient filtration and simplify routine aquarium maintenance.
Calcium Reactor Media
We also stock specialist calcium reactor media, including CaribSea ARM Extra Coarse, designed to supply calcium and alkalinity when used in a correctly operated calcium reactor.
Why Shop at Rock ’N’ Critters?
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Carefully selected filtration products for marine and reef aquariums.
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Trusted brands for mechanical, biological and chemical filtration.
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Solutions for water clarity, nutrient management and aquarium maintenance.
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Practical advice from experienced marine aquarium specialists.
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Convenient online ordering and a dedicated marine aquarium showroom in Barry, South Wales.
Explore our aquarium filter media and removers today and find the right filtration solution for your reef aquarium.