Filtration for Cooling Towers, Chillers & HVAC Loops
Open cooling towers scrub the air on every pass — depositing dust, pollen, biological growth, scale, and corrosion product into the recirculating loop. Without continuous filtration, that load fouls heat exchangers, plugs nozzles, and creates the biofilm that Legionella thrives in.
K Factor automatic backwash filters protect makeup, side-stream, and full-flow loops with continuous self-cleaning operation — no disposable media, no shutdown windows, and no manual basket pulls.
The filtration challenges in this industry
Scale on heat exchangers
Every millimeter of scale on a chiller tube reduces heat transfer 5–10%, forcing compressors to run longer and consume more energy for the same cooling load.
Legionella & biofilm risk
Biofilm shelters Legionella from biocide treatment. Continuous filtration removes the suspended solids that biofilm needs to anchor and grow.
Spray nozzle plugging
Plugged nozzles produce uneven water distribution, hot spots in the fill, and accelerated structural degradation of the tower.
Manual strainer maintenance
Basket strainers require scheduled pulls and cleaning, often ignored until plugged — at which point bypass valves open and contamination flows downstream.
How K Factor solves them
K-Optifil® on side-stream loops
Continuous automatic backwash on a 10–25% side-stream removes suspended solids 24/7 without interrupting the main loop.
Inline strainers on makeup
5–500 GPM strainers on makeup water prevent municipal-line debris from entering the tower basin.
Chiller-tube protection
Filter sized to chiller flow keeps tube interiors clear and preserves design heat-transfer coefficient.
Differential-pressure-triggered cleaning
Backwash fires only when dP rises — minimizing reject volume and water waste compared to timer-based systems.
Recommended products
Filter platforms most often deployed in this industry.
Application detail pages
Process-specific deep-dives within this industry.
Frequently asked questions
What is the best filter for a cooling tower?
An automatic backwash pressure filter on a 10–25% side-stream loop is the standard solution. It runs continuously without disposable media, fires backwash only when differential pressure rises, and removes the suspended solids that scale heat exchangers and feed biofilm.
How does cooling tower filtration prevent Legionella?
Legionella colonizes biofilm, and biofilm anchors to suspended solids. Continuous side-stream filtration removes those solids before biofilm can establish — making biocide treatment more effective and reducing Legionella risk as one layer of a broader water-management program.
How much energy does cooling tower fouling cost?
Heat-exchanger fouling typically increases chiller energy use 10–15%, with each millimeter of scale cutting heat transfer 5–10%. Continuous side-stream filtration preserves the design heat-transfer coefficient and pays back through reduced compressor runtime.
Side-stream or full-flow filtration?
Most cooling tower loops are well served by a 10–25% side-stream filter. Full-flow makes sense for high-fouling source water or when chiller tubes are unusually sensitive.
Will the backwash water count as blowdown?
Backwash reject can often be routed to existing blowdown or sewer lines. Reject volumes are typically 1–3% of throughput on dP-triggered cleaning.
Talk to an industry specialist
Tell us about your flow rate, fluid, contamination profile, and uptime requirements. We'll match you to the right K Factor platform — or engineer one to spec — and back it with a 30-day in-plant trial.