Reference Letters

Reference Letters

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  • OLYMPIA THAI TOWERS – BANGKOK

    RE: EST

    Rangsit Udomphol

    Fri 23/06, 13:06

    rasna@olympiathaitower.com;

    Dear K. Dick and K. Manee

    Hope you are doing well.

    I cannot thank you enough for providing us with your EST system and that we are among the first users of the new technology – electrocoagulation in our cooling tower. More important is your full support and guidance with high degree of precision and thoroughness to keep the system running in top condition. We sincerely hope other CT owners would be fortunate to have your system as integral part of their chiller-ct water treatment system which will make their system more complete. With your constant hard work, the long term goal of making the greener and cleaner world will be more of a reality.

      With best regards

      Rangsit Udomphol, Managing Director

      Olympia Thai Tower Ltd, Bangkok

  • AB Food & Beverages (Thailand) Ltd.

    Factory

    89/5 Soi Wat Suan Som

    Poochaosamingprai Road Samrongtai , Prapradaeng Samutprakarn 10130

    Tel +66 (2) 363 9000

    Fax +66 (2) 363 9001

    To whom it may concern,
    Elgressy EST Electrochemical System

    We have installed 2 EST cooling tower treatment systems for purpose of controlling water quality and to eliminate the need to add water treatment chemicals in cooling water loops.

    The systems are running since 5 years to our satisfaction.

    Rolf Haas

    Regional Engineering Manager,AB Food & Beverages (Thailand) Ltd.

  • ISRAEL AIRPORTS AUTHORITY

    To whom it may concern,

    We hereby confirm that we are operating an Elgressy EST system for water treatment in our hospital.

    The Elgressy EST system is functioning according to our requirements and to our satisfactory for the last 6 years.

    Our Cooling Tower and Heat Exchanger system have a benefits in many aspects.

    With cleaner water conditions, no algae and bacteria Legionella was found in the cooling tower as well as scale was disappear in the system.

    We are satisfied with the results of EST System and would recommend to any organization concerned with environmentally friendly way of saving operation expenses for cooling tower.

    Respectfully yours,

    Vainstein Gregori

    UNILEVER - SELECTA - MANILA - PHILIPPINES From: Jimenez, Michael Sent: Friday, December 3, 2021 11:15 AM To: Aeriallift Asia ALA; Abenido, Jun; Manee Kaewloy Cc: melchor.dado@gljm-dssc.com; Lolita Leviste Subject: RE: [External] - Hi Hi Dick, Just recently, we had our EST serviced by GLJM, led by Mel Dado. Lots of scales recovered from the EST and no scales found on the condenser coils. I will collect some pictures and send.

  • RABIN MEDIACL CENTER – TEL AVIV – ISRAEL

    To whom it may concern,

    We hereby confirm that we are operating an Elgressy EST system for water treatment in our hospital.

    The Elgressy EST system is functioning according to our requirements and to our satisfactory for many years. Our Cooling Tower and Heat Exchanger system have a benefits in many aspects.

    With cleaner water conditions, no elgae and bacteria Ligionella was found in the cooling tower as well as scale was disappear in the system.

    We are satisfied with the results of EST System and would recommend to any organization concerned with environmentally friendly way of saving operation expenses for cooling tower.
    Respectfully yours,

    Eng. Zvika Shalam

    Maintenance Department

  • ASSUTA HOSPITAL – ISRAEL

    To whom it may concern,

    We hereby confirm that we are operating an Elgressy EST system for water treatment in our hospital.

    The Elgressy EST system is functioning according to our requirements and to our satisfactory for the last 6 years.

    Our Cooling Tower and Heat Exchanger system have a benefits in many aspects.

    With cleaner water conditions, no elgae and bacteria Ligionella was found in the cooling tower as well as scale was disappear in the system.
    We are satisfied with the results of EST System and would recommend to any organization concerned with environmentally friendly way of saving operation expenses for cooling tower.

    Respectfully yours,

    Zion Z

    Assuta Hospital Israel

  • Elgressy EST systems

    partial List of references for World Wide and Thailand
    Manager Tel. No. Name
    Water Treatment Year of installment No. of units
    Customers – Units – Details Azrieli Center EST 25 45 m3/h 3 units Cooling.T Moshe Slivkin 03-6212400
    Plason EST 10 5 m3/h 2 units Cooling.T Amnon 04-6394769
    Hakiriya Center Ashdod EST 15 20 m3/h 2 units Cooling.T Yithak Mazor 08-8652440
    U.S. Embassy EST 15 8 m3/h 1 unit Cooling.T Sassoon Musai 03-5197468

    Ministery of Defense (I.D.F) EST25 5 units Drinking Water Mark 03-7377128
    Dan Garage Tel Aviv EST 15 8 m3/h 1unit
    Tel Hashomer EST 25 70 m3/h 2 units Boris 03-5303859
    Ihilov Hospital (Weizman Center) EST 17 units +Drinking Drori 03-6925790
    Israel Prison Drinking Water EST 25 36 units EL 10
    Ihilov hospital (Weitzman Center) Drinking Water Vlademir 08-9776543
    Israel Prison Buildings EST 10 3 m3/h 36 I.B. 08-8683888
    Maarachot Uvda Camps EST 10 5 m3/h 13 ARMY Drinking Waterr Yuri 052-2661346
    Assuta Hospital Lev EST 25 50 m3/h 2
    Hamifratz Grand Court Hotel EST 25 25 m3/h 2 Cooling.T Lazar 03-9630540
    Drinking water Col Sayke 03-7951130
    David Intercontinental Hotel EST+L 10 4 m3/h 8 Alex Shofman 02-6551782
    Hamachon Lebikoret EST 10 4 m3/h
    Health Ministry Drinking water 08-6363636
    Paradise Hotel EST 10 4 m3/h 5
    Rivka Ziv Hospital EST+L 15 15 m3/h 2 Laundries Eyal Tzeiri 04-6828019
    Dispenser Lin EST 25 7 m3/h 1 Cooling.T Nisim 04-8216688
    Moshe Dahan Drinking Water I.D.F. EST 15 8 m3/h Cooling Mike Gilpin 937-776-2841
    Toyota USA EST 25-3-25 Cooling Towers Chen Ziyu chenzy@vcmc.com.cn
    Volvo China EST 25-3-25 Cooling Towers Mike Gilpin 937-776-2841
    Ford USA EST 25-3-25 Cooling Towers Mike Gilpin 937-776-2841T
    Honda USA EST 25-3-25
    BMW China Factory TBA
    Mercedes Benz China TBA

  • Chaophaya Fishery Co.

    Thailand EST 25 25m3/h 1 Apr20 Cooling Tower Mr. Prasit +6681902 6695

    UNESCAP – Thailand Cooling Towers Mr. Songkiet Bubang +6687505 3561 2 x double EST25-3-25 50 m3 + 1 x EL CHL

    Ab Food & Beverages Thailand Cooling Towers 4 x EST

    Miss +66874243535

    Mitsubishi – Motors -LaemChabang – Thailand Miss Pattamawan Cooling Towers
    Mitsubishi Motors EST 25-3-25 25 m3 Phase 2
    Olympia Towers -Thailand – Cooling Towers EST 25-3-25 25 m3/h
    Bridgestone Rangsit – Thailand Cooling Towers EST 25-3-25 25 m3/h
    ISUZU -Thai Shinryo Tower – Tri Petch Izusu EST 25-3-25 25 m3/h
    Nana Square Bangkok – Thailand Cooling Tower EWT10-1-12 10 m3/h 1 2018 Khun Aekasit

    Beta Weave – Thailand – Cooling Tower – EST

    SCG – KRAFT – Thailand – Cooling Tower – EST

    Thai Yang Kitpaisan – TYK – Thailand – EST 25-3-25 Pose Medical – Thailand – EST 25-3-25

    UNILAB- Medical – Manila – Philippines Double EST 25-3-25
    Holcim – Cement – Philippines – Cooling Tower EST 25-3-25

    Coca Cola Factory Philippines EST

    Eagle Cement – Philippines CoolingTower – EST + EEC

    UNILEVER – Manila – Philippines Cooling Towers – EST Hongkong EST-10-2-12

    Installed 2020 – SCG – Kraft – Thailand – Cooling Towers – EST

  • NEW PROJECTS 2024 – 2025

    United Nations – Bangkok 1 x EL CHL
    UNILAB – Philippines 1 x Double EST 25-3-25
    EAGLE CEMENT – Philippines 1 x EST 25-3-25 + 1 x EEC
    AB FOOD 2 x New D systems

  • VENCO –DENSO

  • Grand Hyatt Hotel - Bogota - Colombia

  • Assuta Hospital

  • Monsov CONSULTING

  • Assaf Harofeh Medical Center

Bogotá, March 19, 2026.
TO WHOM IT MAY CONCERN. As a premier luxury destination, Grand Hyatt Bogota is committed to operating with the highest standards of efficiency, sustainability, and environmental stewardship.
Over the past year, we have implemented the EST system as the exclusive water-treatment solution for our hotel’s cooling towers, fully replacing traditional chemical-dosing methods. Throughout this period, the technology has demonstrated consistent performance and has contributed to the following achievements:
• LEED Platinum Certification: The adoption of a chemical-free treatment solution played a meaningful role in enhancing our Water Performance category, supporting our progression from LEED Gold to LEED Platinum accreditation.
• Operational Excellence: Our cooling towers and chillers have maintained continuous, optimal operation with no evidence of scale formation or corrosion. This has ensured high HVAC efficiency and reliable system performance.
•Grand Hyatt Bogotá is pleased to provide this formal letter of recommendation for Elgressy’s EST technology.
We are highly satisfied with the results achieved and the operational benefits realized through its implementation at our property.
Sincerely,
JUAN FELIPE ARDILA BENAVIDES Director of Engineering Fideicomiso GH Bogota Fidubogota – Grand Hyatt Bogota Hotel

Monosov Consulting.

MONOSOV CONSULTING LLC 8737 N Range Line Rd. River Hills, WI 53217 F.:+1414-446-5243 ; T.: +1-262-707-3880 1 Date: June 12, 2015 Mr. G. Elgressy Elgressy Engineering Services Ltd. Elgressy House, En Vered, Tel Mond 40696, Israel Dear Mr. Elgressy: I have reviewed the data and information you sent me about the chlorine dioxide production by your LPB electrochemical disinfection water treatment systems. I confirm that small amount of chlorine dioxide can be generated through reaction of chlorate ions with hydrochloric acid during the electrolysis of low concentrated NaCl solutions. It was found that for solution with low NaCl concentrations, hypochlorite formation is determined by mass transfer of chloride. The formation of chlorate at a chlorine and oxygen-evolving anode is ascribed to two reactions, namely, the direct oxidation of chloride to chlorate and the conversion of hypochlorite. This is suggested to split the well-known electrochemical Foerster reaction into a chemical reaction for the conversion of hypochlorite in chlorate and the electrochemical oxidation reaction of water The theory of Foerster and Mueller regarding the reactions in chlorate cells is the most accepted. The following reactions are said to take place at the electrodes: At the anode: 2Cl- Cl2(aq) + 2 electrons At the cathode: 2H2O + 2 electrons H2 + 2OHThe dissolved chlorine gas can then react with water to give hypochlorous acid (HClO): Cl2(aq) + H2O HClO + H+ + Cl- From this reaction it can be seen that if the chlorine does not dissolve but escapes to the atmosphere, no H+ will be generated to neutralize the OH- formed at the cathode and the pH of the electrolyte will increase. The hypochlorous acid thus formed will react in acid-base equilibrium reactions with water to give hypochlorite ions and chlorine gas (dissolved). The exact concentrations of dissolved Cl2, Hypochlorite (ClO- ) and HClO depend on the pH, temperature and pressure among other things. MONOSOV CONSULTING LLC 8737 N Range Line Rd. River Hills, WI 53217 F.:+1414-446-5243 ; T.: +1-262-707-3880 2 In the solution, chlorate will be formed (mainly) by the following reactions: 2HClO + ClO- ClO3- + H+ + 2Cland 2HClO + ClO- +2OH- ClO3- + 2Cl- + H2O Alternatively, chlorate may also be formed by oxidation of hypochlorite at the anode as follows: 6HClO + 3H2O 3/2 O2 + 4Cl- + 2ClO3- + 12H+ + 6 electrons The chlorate is converted to chlorine dioxide by reacting with hydrochloric acid according to following equation: 2HClO3 + 2HCl 2ClO2 + Cl2 + 2H2O According to the above theoretical explanation the formation of chlorine dioxide is feasible and can occur through electrolysis of low concentrated NaCl solutions. Regards, Dr. Efim Monosov - PhD

EST reference from Assuta Hospital

LPB reference Assaf Harofeh Medical Hospital

Please contact us right away for a free demonstration

+66639578383

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Aerial Lift Asia is official and exclusive distributor of ELGRESSY for S.E. Asia.

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