Minimize the odor at the source.
Covex® is a hexagonal floating cover that seals the water-air interface across your lagoons and ponds. It cuts the odor emissions that reach nearby communities, blocks the light that drives algae, and reduces evaporation, while the air chamber in each module helps retain heat in biological treatment. In dechlorination basins, it can also cut chlorine consumption by 10% to 30%.
It all starts at the water-air interface.
Every open lagoon and pond in a treatment plant exchanges gases, light and heat with the air across its entire surface. That single interface is where odors escape to the community, where sunlight feeds algae, and where chlorine and heat are lost. Seal it, and you act on all of them at once.
Odor and the community
Volatile compounds (H₂S, ammonia, mercaptans) leave the open surface and reach neighboring communities. Odor complaints are the single most common source of regulatory pressure and conflict for a treatment plant.
Algae and chlorine demand
Sunlight on the open surface fuels algae. Blooms raise turbidity and organic load, clog filters, and push up the chlorine and reagent dose needed downstream to hit discharge limits.
Evaporation and heat loss
Open lagoons lose water to evaporation and shed heat to the air at night, cooling the biology and slowing the treatment process exactly when stable temperature matters most.
A cover that self-installs and self-adjusts.
The hexagonal HDPE modules float, interlock, and settle on their own to the reservoir level. They require no structure, anchoring, or maintenance. Each unit carries water ballast that keeps it in place even in extreme wind.
Cuts odor at the source
By sealing 98% of the liquid surface, the cover keeps volatile compounds from escaping to the air. Validated by independent olfactometry.
Less chlorine in dechlorination
By controlling algae and stabilizing water quality upstream, the cover lowers the chlorine demand in dechlorination basins.
Stops algae growth
By blocking light, it inhibits photosynthesis, reducing turbidity, biofilm and the organic load that drives reagent dose.
Less evaporation, retained heat
The physical barrier cuts water-to-air exchange, while the air chamber in each module slows nighttime heat loss in the biology.
The same cover, the value that matters at each stage.
The physics of the water-air interface is universal, but the priority changes with the stage of treatment. Find your pond below.
Aerated & Facultative Lagoons
- Odor containment over the largest emitting surface in the plant: sealing the interface keeps H₂S, ammonia and mercaptans from reaching the community.
- Heat retention in the biology: the air chamber slows nighttime cooling, helping keep microbial activity stable in cold climates.
- Algae control that prevents blooms from raising effluent solids and organic load.
- The cover floats and self-adjusts to level, with no structure or anchoring and no interference with surface aerators where layout allows.
Dechlorination & Contact Basins
- Lower chlorine consumption: by controlling algae and stabilizing water quality upstream, the cover can cut chlorine demand in dechlorination basins by 10% to 30%.
- Less light-driven degradation of the water held in the basin, keeping quality more stable through the contact time.
- Evaporation control on basins that hold treated water before discharge or reuse.
- A continuous physical barrier that needs no power, no dosing and no moving parts.
Sludge Ponds & Reuse Storage
- Odor mitigation over sludge and digestate lagoons, the most complaint-prone surfaces on many sites.
- Algae and quality protection for treated water stored before reuse in irrigation or industry.
- Evaporation control that preserves the volume of water held for reuse.
- Bird exclusion over open surfaces, reducing nutrient and pathogen inputs to stored water.
The odor leaves through the surface.
Odor is a surface phenomenon: volatile compounds escape where the water meets the air. By covering 98% of that interface with a continuous physical barrier, Covex® keeps those compounds in the liquid instead of in the air your neighbors breathe. The effect has been quantified by independent olfactometry.
Up to 90% less odor at the property line.
An independent olfactometry study measured the odor concentration above the liquid surface with and without the floating cover. Sealing the interface cut the emission rate dramatically, the difference between a plant that generates community complaints and one that does not.
Because the barrier is physical and passive, the benefit is constant: it works 24 hours a day, in every season, with no power, no dosing and no maintenance.
Clearer water in, less chlorine out.
Chlorine demand is driven by the organic and biological load reaching the disinfection stage. By blocking the light that feeds algae and stabilizing water quality across the upstream ponds, Covex® lowers that load, which can translate into 10% to 30% less chlorine consumption in dechlorination basins. It is a recurring operating saving on top of the odor and evaporation benefits.
10% to 30% less in dechlorination
A more stable, lower-algae water reaching the disinfection stage reduces the chlorine dose required to meet discharge limits. The exact figure depends on basin design and incoming water quality.
Algae stopped before they bloom
Blocking 98% of solar radiation inhibits photosynthesis, cutting algae growth by up to 95% and the turbidity and organic load that drive reagent demand downstream.
Independent technical validation
The system carries independent olfactometry for odor and evaporation and thermal-behavior validation through TRNSYS and CFD modeling, with academic institutions and water research centers.
Zero maintenance, automatic adjustment
The hexagons rearrange themselves as the level changes. There is no power draw, no dosing equipment and no moving parts to service.
Data measured on site, not catalog promises.
Trusted across water, utilities and heavy industry.
Let us calculate the savings.
Tell us about your ponds and we will provide an estimate of odor reduction, chlorine and chemical savings, recovered water, and payback for your plant.
A specialist will review your site data and contact you with a savings and payback estimate.