Hong Kong, March 2025 — The Consumer Council (消委會) has released a comprehensive test of 17 commonly available drain unblockers sold at local supermarkets and home improvement stores, uncovering a staggering price gap of over 50 times between the cheapest and most expensive options. The study, published in the Council’s Choice magazine, found that while 10 products effectively dissolve grease and hair blockages, improper use can release toxic fumes or cause severe chemical burns—prompting the release of eight critical safety recommendations.
Price Disparity and Product Range
The tested samples, purchased from chain supermarkets and household goods retailers, included well-known brands such as CLOROX, Daiso, Lion, and Mr. Muscle. Prices ranged from HK$10 to HK$79.9 per unit, while the actual cost per application varied from approximately HK$1.5 to HK$79.9—a difference of more than 50 times. Products came in six different formats: six liquid formulas, three granular types, three gels, two powders, two foam products, and one stick-style cleaner.
Dual-Use Versatility: 12 Products Handle Kitchen and Toilet Drains
Among the 17 items, 12 were labelled as suitable for both kitchen sinks and toilet drains—a key feature for households seeking a single solution. The Council noted that different drains face distinct clogging challenges:
- Kitchen sinks: Grease and cooking oil cool and solidify inside pipes, narrowing the passage and trapping debris.
- Bathroom drains: Hair mixed with soap scum forms stubborn clogs in washbasins, bathtubs, and shower floors.
- Toilets: Excessive toilet paper, sanitary pads, wet wipes, and paper towels are common culprits.
The 10 products flagged by the Council for their fast-acting performance on grease and hair were highlighted as effective for typical household blockages. However, five samples explicitly stated they were not suitable for toilet drains due to their chemical composition, which could damage porcelain or seals.
Safety First: Council Warns of Toxic Gas and Burn Risks
The Consumer Council underscored that misuse of chemical drain cleaners can lead to serious accidents. When mixed improperly or used in confined spaces, certain formulas may generate toxic gases or cause chemical burns to skin and eyes. The report emphasized that not all products are compatible with every pipe material—metal, rubber, or enamel surfaces can be corroded by strong acids, alkalis, or oxidizing agents.
To minimise hazards, the Council issued eight essential safety guidelines:
- Read labels thoroughly before use; never mix with other cleaning agents.
- Wear protective gear: safety goggles (no contact lenses), a mask, and plastic gloves—avoid ordinary work gloves, which may absorb chemicals and worsen burns.
- Ensure ventilation to prevent gas buildup or oxygen depletion. Unless instructed otherwise, siphon standing water before adding the product.
- If skin is splashed, rinse immediately with plenty of water. Avoid letting runoff water touch other skin areas.
- For severe chemical burns over large areas, seek medical help urgently and bring the product packaging for reference.
- When opening storage areas, check for pungent odours and avoid inhaling trapped air.
- After use, clean all external surfaces of the container and seal it tightly to prevent accidental spills.
- Store leftover product in its original packaging only—strong alkalis like sodium hydroxide can corrode glass containers, leading to leaks.
Broader Impact and Next Steps
The findings come as Hong Kong households increasingly rely on DIY drain solutions to avoid costly plumber visits. However, the Council’s test highlights that choosing a product is not simply a matter of price—it requires matching the formula to the clog type and pipe material. Consumers are urged to consult the full report in Choice magazine issue 559 for detailed comparisons.
For those seeking professional alternatives, the Council recommends preventive measures such as using drain strainers, regularly flushing drains with hot water, and avoiding pouring grease down the sink. As clog-related accidents remain a common household hazard, the new guidelines aim to empower safer, more informed decisions—saving both money and potential injury.