Nyos Phosi-Ex – Phosphate & Silicate Remover for Reef Aquariums
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Nyos Phosi-Ex – Phosphate & Silicate Remover
Powerful Phosphate & Silicate Control
Nyos Phosi-Ex is a premium, moist iron-based adsorption media developed to remove excess phosphate (PO₄) and silicate (SiO₂) from marine and reef aquariums.
Elevated phosphate can interfere with coral calcification and contribute to unwanted algae growth, while excess silicate may encourage diatom blooms.
Phosi-Ex helps maintain cleaner aquarium water by binding these dissolved substances to its surface, allowing them to be removed when the exhausted media is replaced.
Key Features & Benefits
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Dual-action removal – Adsorbs both phosphate and silicate.
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High adsorption capacity – Efficient nutrient removal using moist iron-based media.
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Helps control nuisance algae – Reduces phosphate availability that can encourage unwanted growth.
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Aluminium-free formulation – Does not release aluminium into aquarium water.
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pH-neutral operation – Designed to work without changing aquarium pH.
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Supports water clarity – Helps maintain clean, clear reef aquarium water.
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Suitable for reef filtration – Ideal for sumps and compatible media reactors.
How Does Phosi-Ex Work?
The iron-based media attracts and binds dissolved phosphate and silicate through adsorption.
Unlike liquid phosphate treatments, Phosi-Ex works continuously as aquarium water passes over the media.
Once the media reaches its adsorption capacity, it should be replaced to maintain effective removal.
Recommended Dosage
Nyos manufacturer guidance:
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150–200ml per 500 litres of aquarium water.
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Advertised treatment capacity: 1,000–2,000 litres of seawater at an initial phosphate concentration of 0.5ppm.
Actual media life depends on phosphate and silicate levels, water flow and the aquarium's ongoing nutrient input.
Installation & Maintenance
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Measure the required quantity for your aquarium.
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Place the media in a compatible reactor or suitable filter media bag.
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Ensure water passes through the media without excessive agitation.
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Test phosphate regularly to monitor performance.
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Replace the media when phosphate begins rising or removal becomes ineffective.
Avoid reducing phosphate too rapidly or stripping it to undetectable levels, particularly in established coral systems.
Why Choose Nyos Phosi-Ex?
An excellent choice for reef keepers seeking reliable, ongoing phosphate and silicate control without liquid dosing.
Nyos Phosi-Ex – effective nutrient adsorption for cleaner reef aquarium water.
