Quick answers on water treatment in Hong Kong — cooling towers, Legionella rules, potable water, laboratory testing, pool chlorine and how to work with Gotech.
Gotech Chemical Ltd is a water treatment company founded in 1982, serving Hong Kong. We treat, clean, disinfect, test and monitor water systems for hospitals, hotels, malls, offices, factories, housing estates and pools.
All districts of Hong Kong. Our office is in Kwai Chung, New Territories.
Dosing to control scale and corrosion, biocide dosing to control bacteria including Legionella, regular water testing, and scheduled cleaning and disinfection — with a dated report after every visit.
The EMSD Code of Practice applies. Below 10 cfu/mL counts as “undetected”; at or above 1,000 cfu/mL the EMSD issues a nuisance notice requiring emergency decontamination. Since 2011 the EMSD can sample towers at random.
The EMSD Code of Practice expects cleaning, desludging and disinfection at least every six months — more often for dusty or high-load sites, and whenever a test result calls for it. We set a schedule that keeps you compliant.
Cleaning and disinfecting drinking water tanks and pipes — for new or repaired systems, after contamination, or as routine maintenance — confirmed by laboratory testing.
Pre-commission cleaning of new chilled or heating pipework to remove scale, debris and biofilm before the system starts, so it runs efficiently and lasts longer.
Yes — drinking water, pool water, cooling water and Legionella, with formal reports for your compliance or tender files.
Yes. We supply chlorine tablets in 1 kg packs and 25 kg drums, and sodium hypochlorite in custom volumes — see the full pool chemicals range. Message us on WhatsApp for a quote.
Call (852) 5923 7263, WhatsApp us, or send the enquiry form. Tell us your building type and what you need, and we will reply with a written quotation.
Almost always. Under the Swimming Pools Regulation (Cap. 132CA), a pool the public can access, or that is run by a club, institution or other organisation, must be licensed by FEHD; the only exemption is a pool serving not more than 20 residential units with no public access. The licence requires daily free chlorine and pH tests logged in a register — see our guide to swimming pool licence requirements in Hong Kong.
Slow-dissolve tablets suit smaller pools and manual top-up — they give a steadier residual, but add stabiliser (cyanuric acid) with every dose. Liquid chlorine (sodium hypochlorite) suits dosing systems, indoor and high-turnover pools, but loses strength in storage, so order it to actual usage rather than stockpiling. Never mix the two. Full comparison: chlorine tablets vs liquid chlorine.
Not automatically — inspect first. If the covers, screens and overflows are intact, the pump room stayed dry and the water looks and smells normal, record the inspection and carry on. If there is any sign of ingress — discolouration, odour, sediment, debris or floodwater over the tank — take the tank out of drinking service and test, clean, disinfect and re-test before the water is used again. See fresh water tanks after a typhoon or flooding.
Seven things: work to the EMSD Code of Practice (2023 edition), a dated written report after every visit, laboratory testing with formal certificates, emergency response capability, chemicals matched to your system, safety-trained staff who carry identification, and a willingness to provide references and tender documents. See how to choose a cooling tower contractor in Hong Kong.
Usually, but not because of the pipe replacement. Discounted at 8%, a HK$5,000,000 replacement 25 years away is worth about HK$730,000 today. The stronger arguments are the annual energy waste from scale and fouling — 1/32 inch of scale can cut heat exchange effectiveness by over 10% — and the fact that corrosion drags a large capital replacement forward in time, which is expensive in present-value terms. The full model is on the real cost of doing nothing.
Ask us directly and we will get back to you.