Wet Scrubbers
Hydrogen sulfide and odor in wet-scrubber loops that conventional chemistry struggles to knock down cleanly.
Learn more
Industrial & Cooling
One ORP-controlled chemical replaces the biocide-plus-dispersant stack — controlling biofilm, scale, corrosion, and Legionella at once.
D&Z Worldwide supplies industrial and cooling-water operations with a single ORP-controlled mineral oxychloride chemical, DZ 9450 or DZ 9966, replacing the separate biocide and dispersant stack. It controls biofilm, algae, scale, and corrosion together. At target ORP it is 12 to 24 times more effective than chlorine, and holding above +700 mV delivers a 6-log Legionella reduction in under 10 seconds.
12–24×More effective than chlorine at target ORP
<10 secMicrobial kill time at the target ORP
20%+Electricity savings cited by a California electric utility
6-logLegionella reduction in under 10 seconds above +700 mV
Challenges We Solve
What fouls a cooling system?
Biofilm & Corrosion
Biofilm on a heat-transfer surface is 300% worse than calcium-carbonate scale — ASHRAE notes a fouling factor of just 0.001 can cut efficiency around 10%. Biofilm also shields anaerobic bacteria, driving pitting and microbially-influenced corrosion.
Legionella Risk
Legionella prefers 20–50°C (optimum 37°C), and roughly 90% of it lives inside biofilm, where it grows more resistant and harbors amoebae. Control the biofilm and you control the risk.
Treatment Approach
Can one chemical be controlled by ORP?
A single-chemical, ORP-controlled mineral oxychloride program — DZ 9450 or DZ 9966, both NSF/ANSI 60 certified — controls biofilm, algae, scale, and corrosion together while lowering cost, improving heat transfer, and reducing Legionella risk. At target ORP the chemistry is 12–24× more effective than chlorine, with microbial kill in under 10 seconds.
For Legionella specifically, holding ORP above +700 mV delivers a 6-log reduction in under 10 seconds and, per independent pathogen laboratory testing, eliminates legionellosis in most systems in under four hours. The same oxidation works in wet scrubbers to eliminate H₂S, and — unlike ozone — leaves a lasting residual for zebra- and quagga-mussel control.
i
ORP is the control point
Rather than dosing biocide and dispersant separately by ppm, operators hold a target oxidation-reduction potential in millivolts. Because kill efficacy tracks ORP, a single set-point manages disinfection, biofilm, and corrosion together.
Proven Results
Cooling and scrubber numbers.
| Result | Performance | Source / context |
|---|---|---|
| Effectiveness vs chlorine | 12–24× | Biofilm, bacteria, viruses and spores |
| Microbial kill time | <10 sec | At the target ORP |
| Electricity savings | 20%+ | Cited by a California electric utility |
| Legionella reduction | 6-log in <10 sec | Independent pathogen laboratory, above +700 mV |
| Wet-scrubber H₂S removed | 2,000 mg/L | Houston study; ORP shift −150 to +100 mV |
Approved & validated
EPA FIFRARegistered
USDA OrganicCertified
NSF/ANSIStandard 60
Validated by independent pathogen-laboratory testing (Legionella) · a California electric utility · a university biofilm research center
Frequently Asked Questions
Cooling program questions.
Can one chemical really replace our biocide and dispersant?
Yes. A single-chemical, ORP-controlled mineral oxychloride program (DZ 9450 or DZ 9966) controls biofilm, algae, scale, and corrosion together, and at target ORP it is 12 to 24 times more effective than chlorine, with microbial kill in under 10 seconds. Collapsing the biocide-plus-dispersant stack into one ORP-controlled feed lowers cost, improves heat transfer, and reduces Legionella risk. DZ 9966 and DZ 9450 are NSF/ANSI 60 certified, and a California electric utility has cited electricity savings above 20%.
How does this reduce Legionella risk?
Because roughly 90% of Legionella lives inside biofilm, destroying the biofilm is key. Holding ORP above +700 mV delivers a 6-log Legionella reduction in under 10 seconds and, per independent pathogen laboratory testing, can eliminate legionellosis in most systems in under four hours.
Why does biofilm matter more than scale?
Biofilm on a heat-transfer surface is 300% worse than calcium-carbonate scale for heat transfer, and ASHRAE notes a fouling factor of just 0.001 can cut efficiency around 10%. Biofilm also shields anaerobic bacteria that cause pitting and corrosion. Roughly 90% of Legionella lives inside biofilm, where it grows more resistant and harbors amoebae. Controlling the biofilm therefore addresses heat transfer, corrosion, and Legionella risk from a single control point.
Can it handle wet-scrubber H2S?
Yes. In a Houston study on a natural-gas stream carrying 2,000 mg/L H2S, the program achieved complete H2S elimination with an ORP shift from -150 mV to +100 mV, leaving only inert sulfate residuals. The ORP shift is the control signal, moving the loop from a reducing condition to an oxidising one. Because the sulfide is oxidised through to sulfate, the hydrogen sulfide and its odor leave the scrubber loop instead of recirculating.
What about zebra and quagga mussels?
Mineral oxychloride delivers ozone-class oxidation but, unlike ozone, holds a lasting residual, so protection persists through intakes and piping rather than dissipating. Invasive zebra and quagga mussels colonize exactly those intakes and piping, which is where ozone dissipates too fast to hold a protective residual. Carrying oxidation potential downstream of the injection point is what lets one feed cover the length of the intake instead of only the point of contact.