Phosphorus recovery solution
Letonite Filter System
A smart, sustainable solution for phosphorus removal in small-to-medium wastewater treatment plants.
The Letonite Filter System is non-corrosive, easy to install, and delivers up to 95% phosphorus removal efficiency. It helps treatment plants cut costs and meet strict EU regulations—without the downsides of chemical-based solutions. Clean water. Circular impact.
How it works
The Letonite filter is installed at the final stage of biological treatment, providing an efficient solution for phosphorus removal. It uses a cartridge filled with a proprietary mineral material, delivered in bulk (big bags), and designed for easy replacement on a regular schedule.
Letonite filter can be used as an alternative to chemical phosphorus reduction methods or as a polishing step to remove the remaining pollution.
Once saturated, the spent material can be air-dried and safely reused as a phosphorus-enriched soil amendment, supporting circular use in agriculture.
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Application areas
Regulated manufacturing companies and municipalities struggling to remove phosphorus from their wastewater streams.
Key benefits
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Up to 95% phosphorus removal efficiency
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Cost-effective alternative to chemical treatment
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No chemical sludge, non-corrosive, easy to handle
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Supports compliance with strict EU discharge limits
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After saturation, can be used directly as a phosphorus-enriched soil amendment
Pilot the Letonite Filter System
Demonstration pilots start in 2025 in Latvia, the Netherlands, and Germany (additional countries to follow). We’re looking for municipal and industrial partners to join.
Pilot properties:
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‘Plug and Play’ type of system
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1.5–10 m³/day or up to 50 PE
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Side-stream treatment
Soil solution
Letonite Phosphorus-Enriched Soil Amendment
A dual-benefit solution designed to boost soil health and supply plant-available phosphorus
Application areas
Ideal for use on acidic soils across the Baltics, Poland, Germany, and beyond.
Key benefits
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Enhances soil pH — ideal for acidic soils
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Provides a slow-release, plant-available phosphorus source
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Low in heavy metals, safe for repeated use
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Circular solution — supports sustainability in farming