A Federal Field Study Validated Non-Chemical Water Treatment for Cooling Towers
NREL and the U.S. Department of Energy tested Clear Comfort's AOP technology at the Denver Federal Center. The resulting GSA-published report now guides federal procurement — download it free.
26%
Makeup water savings measured in field testing
50%
Cooling tower maintenance hours cut annually
2.2 Years
Simple payback period at GSA's average water rate
INDEPENDENTLY VALIDATED • GSA PROVING GROUND
- NREL Field Evaluation Team, GSA Proving Ground Report
"Advanced oxidation technology is not likely to require any chemicals in most installations." A follow-up 2018 NREL study found the AOP had the lowest biological growthof any system evaluated.
Installed costs, itemized to the dollar
Equipment, install, and annual maintenance costs from a real federal deployment.
Head-to-head performance data
Water savings, install time, and cost of four alternative water treatment technologies, same protocol.
GSA's own vendor-evaluation checklist
The exact criteria procurement teams are told to apply – cybersecurity, water chemistry, servicing, warranty.
Payback modeling across 16 climate zones
Savings-to-investment ratios by region, from NREL's own EnergyPlus modeling.
A
C
D
B
GSA's Proving Ground
Selected AOP as one of six alternative treatment technologies for in-field validation across federal facilities.
National Renewable Energy Laboratory
Ran the independent field study, instrumented the test site, and authored the findings, no vendor impact in results.
U.S. Department of Energy
Co-funded the evaluation under its High Impact Technology Catalyst program, alongside GSA.
The Comparison
Four technologies, evaluated under one federal protocol.
Every number below comes straight from the NREL field report — not from any vendor's data sheet.
Technology
Water Savings
Install Time
Installed Cost
Payback
AOP (Clear Comfort)
26%
~3 hours
$23,425
2.2 yrs
Electrochemical
32%
< 2 days
$45,340
3.0 yrs
Salt-Based Ion Exchange
23%
2 days
$29,600
2.2 yrs
Chemical Scale-Inhibition
24%
~1 week
$32,511
2.7 yrs
Source: GSA Guidance — Alternative Water Treatment Systems for Cooling Towers, NREL/TP-7A40-73940, Jan. 2020. Results are site-specific; full methodology in the report.
GSA's Proving Ground
Selected AOP as one of six alternative treatment technologies for in-field validation across federal facilities.
National Renewable Energy Laboratory
Ran the independent field study, instrumented the test site, and authored the findings, no vendor impact in results.
U.S. Department of Energy
Co-funded the evaluation under its High Impact Technology Catalyst program, alongside GSA.
Federal Field Study Validates Non-Chemical Water Treatment for Cooling Towers
With cooling towers under pressure to use less water without sacrificing performance, GSA and the U.S. Department of Energy worked with NREL to evaluate alternative water treatment using real-world field data. Download the free study packet.
26%
Makeup water savings measured in field testing
50%
Cooling tower maintenance hours cut annually
2.2 Years
Simple payback period at GSA's average water rate
Third-Party Field Testing • GSA PROVING GROUND
Download the Study Packet
See how a federally evaluated cooling tower treatment approach reduced water use, maintenance time and chemical demand.