Cut evaporation, algae and odor in your plant.
Covex® is a hexagonal floating cover that seals the liquid-air interface. On process water, cooling basins, fire water and storage ponds it cuts evaporation, reduces heat loss, suppresses odor, blocks algae, and keeps birds and wildlife off your open water.
It all starts at the liquid-air interface.
Wherever process water, cooling water or stored water meets the air, the same things happen across the whole plant: water evaporates, heat escapes, light feeds algae, odors drift to the fence line, and the open surface draws in birds. Every uncovered pond and open tank is a silent, daily loss.
Evaporation & heat loss
Open process and storage ponds lose water to the air every day, and heated or cooling water loses temperature through the surface. Both translate into more makeup water and more energy to hold the plant at setpoint.
Algae, biofilm & odor
Sunlight on the open surface drives algae and biofilm that clog pumps, filters and intakes and force extra treatment. On organic-loaded water, the same open surface lets odor reach nearby communities.
Wildlife & housekeeping
Open water attracts birds, mosquitoes and wildlife to ponds that may be chemically loaded or simply off-limits. It is a recurring environmental and housekeeping finding on plant inspections.
How much water and heat is your pond losing right now? Tell us its location and surface area and we send you a quotation with the estimated savings.
Request a quotationA 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 sealed water ballast that keeps it in place in winds up to 100 km/h.
Less evaporation
The physical barrier of the hexagons cuts the mass exchange between liquid and air, preserving stored volume and reducing makeup water across process and storage ponds.
Reduces heat loss on heated ponds
The air chamber inside each module acts as an insulating barrier, cutting heat loss from heated process water and delaying freezing in cooling and fire water basins.
Stops algae & biofilm
By blocking light, it inhibits photosynthesis in the stored water, protecting quality, pumps and intakes, and reducing chemical dosing and odor.
Virtually eliminates the open surface
With no visible reflective surface, birds and wildlife are far less likely to detect the pond, and mosquito breeding is suppressed.
The same cover, the value that matters to your plant.
The physics of the liquid-air interface is universal, but the priority changes with the industry and the fluid. Find your sector below.
Pulp & Paper
- Odour containment over effluent and process ponds, the most common source of fence-line complaints at a mill.
- Heat retention on warm process water, cutting the energy needed to hold temperature.
- Algae and biofilm control that protects water quality and reduces downstream treatment load.
- HDPE formulated for ESCR, resilient against chemically loaded process water.
Food & Beverage
- Odour control over wastewater lagoons, protecting the community and the plant's licence to operate.
- Algae and contamination barrier that keeps stored and reuse water clean.
- Evaporation control that preserves volume and reduces makeup water in process and balancing ponds.
- Wildlife and mosquito exclusion on open ponds, a recurring inspection finding.
Chemical & Energy
- Algae and biofilm control that keeps cooling and fire water clean and protects pumps, intakes and heat exchangers.
- Evaporation control on open basins, reducing makeup water and chemical dosing.
- Heat retention and freeze delay where temperature and cold climate matter to the process.
- HDPE formulated for ESCR, the critical factor against chemically aggressive solutions.
Where temperature matters, the surface is where you lose it.
Covex® works on the water-air interface, and what it protects depends on what is in the pond. Cooling, fire water and storage ponds sit at ambient temperature, so the cover slows how fast they heat up by day and cuts evaporation, and in cold climates it delays the freezing that would threaten their availability. Heated process water carries the energy you paid to put into it, so the cover holds that temperature stable instead of letting the air pull it down, and slows the heat it loses at night. Find your case below.
It slows temperature changes in both directions.
The cover intercepts sunlight before it reaches the water and slows heat exchange with the air. Water warms up later in the day, so at peak sun it runs about 4°C cooler than uncovered water, and at night it loses heat more slowly. That slower cooling is what Case 2 relies on.
It holds the process temperature and delays freezing.
Heated process water carries the energy you paid to put into it, and that heat lost at night must be replaced. The cover holds the temperature stable and, against a -5°C environment, keeps the water up to 5.2°C warmer than the uncovered surface during the first hours of the night. The same insulating barrier delays freezing on any ambient-temperature water, so cooling and fire water basins stay liquid and available longer in cold climates.
The effect is decisive where there is freezing risk: uncovered water reaches 0°C at 7.5 hours, while under Covex® the freezing point is delayed to 12 hours, 60% more time.
Save water and energy, stay clean, keep operating.
Across any industrial plant, the open water surface is where you lose water, lose heat, grow algae and attract problems. Covex® provides a continuous physical barrier that seals 98% of the surface, turning a daily loss into measurable savings and a cleaner, lower-maintenance operation.
Lower water and energy bills
Up to 97% less evaporation means less makeup water; reduced heat loss means less energy to hold temperature. The cover pays back through the resources it stops you from wasting.
Cleaner water, fewer chemicals
Blocking light stops algae and biofilm at the source, protecting pumps, intakes and heat exchangers and cutting the chemical dosing and labor needed to keep ponds in spec.
HDPE grade for harsh fluids
High-density polyethylene withstands contact with chemically loaded and process water. The formulation prioritizes environmental stress cracking resistance (ESCR), the critical factor in industrial water chemistry.
Zero maintenance, automatic adjustment
The hexagons rearrange themselves as the level changes. There is no structure to inspect and no anchors to fail, just a permanent cover that works on its own.
Building the business case for your plant? We quantify the water and energy saved, the chemicals you avoid and the payback, with numbers your team can audit.
Build my business caseAn open industrial pond is a standing invitation to: birds, mosquitoes, odor complaints and inspection findings that no plant wants on the record.
Across industries, open process and storage ponds attract birds and wildlife, breed mosquitoes, and let odor drift to the fence line. The usual responses, fencing, netting, dosing, hazing and covering the surface, vary in effectiveness, and active devices depend on equipment that can fail, drift or lose effectiveness over time.
Facing odor complaints or inspection findings? Ask for the documentation describing Covex® as a passive barrier against odor, birds and mosquitoes.
Request compliance documentationData measured on site, not catalog promises.
Trusted across industry.
Want to hear it from a plant already using Covex®? Ask for a reference site with a comparable process and climate.
Ask for a reference siteLet's do the numbers.
Tell us about your pond or tank and we will provide an estimate of water savings, energy savings, and payback for your site.
Thank you for reaching out. A Covex® specialist will review your request and get back to you.
Technical Resources
See how floating covers control evaporation, algae, and odor in storage and process ponds: floating covers for process and storage ponds.