A popular restaurant chain specialised in flame-grilled burgers, struggled with persistent odour problems in their restrooms. Without proper ventilation or the option to install a traditional extraction system, air quality declined, directly impacting the customer experience. A sustainable, effective solution was urgently needed to eliminate restroom odours and restore a clean, welcoming environment.

Finding the Solution

To address this, Biozone Scientific implemented the Air Care system, designed for continuous odour control and air purification in occupied spaces.

• A trial installation of one Air Care unit was carried out in each restroom for two weeks.
• The system works by actively circulating and purifying the air, breaking down odour-causing compounds and ensuring a consistently fresh environment.

The pilot demonstrated highly positive results, with a noticeable improvement in restroom air quality and significant odour reduction.

Results: Fresher, Cleaner, Better for Customers

✅ Odours eliminated within days of installation.
✅ Improved customer satisfaction, with restrooms matching the brand’s high hygiene standards.
✅ Sustainable operation, offering long-term savings on energy and maintenance.
✅ Scalable solution, easy to replicate across other branches.

But what causes “toilet smell” and “toilet smells like sewage”? The science of bad smells from toilets

Bathroom odours are a cocktail of gases and VOCs produced by waste, plumbing issues and microbial growth:

• Ammonia (NH₃) — from bacterial breakdown of urea in urine; sharp, pungent.
• Hydrogen sulfide (H₂S) — rotten-egg smell from sulfur-containing amino acids in feces; highly noticeable even at low concentrations.
• Thiols (e.g., methanethiol) — strong manure-like smells.
• Fatty acids (butyric, valeric, acetic) — sour/rancid notes from organic decay.
• Indole & skatole — nitrogenous rings that smell fecal at higher concentrations.
• Other VOCs — from cleaning products, building materials, biofilms and microbial VOCs released by bacteria and fungi.

Common plumbing & hygiene sources

• Dry / leaky P-traps (no water seal → sewer gases enter room).
• Blocked vents or clogged drains (anaerobic decomposition in slow drains).
• Porous grout, biofilms under rims, toilet tanks and floor drains trapping organic residue.
• Inadequate ventilation that allows gases to accumulate.

Why smells build up quickly in busy restrooms: small concentrations of these gases add up in enclosed spaces with many users and poor extraction.

Why restroom smells matter for hospitality (and why masking won’t cut it)

A smelly bathroom damages reviews, guest confidence and repeat business. Quick fixes like air fresheners mask odours for minutes or hours and often add VOC pollution. Hospitality needs reliable, continuous solutions that remove odours at the chemical source, so visitors notice clean air, not lingering fragrances.

Why scented odour eliminators often fail (and can make things worse)

• Perception problem. Mixing strong fragrance with sewage smell often creates a worse sensory experience for guests.
• They mask, not remove. Fragrances cover the symptom while ammonia, H₂S and thiols remain.
• They add VOCs. Many sprays release formaldehyde, acetaldehyde, benzene and terpene-based fragrances that can irritate or trigger asthma.
• Short duration. Masking lasts minutes to hours; in busy restrooms, odour builds faster than sprays can cover it.

Why continuous purification (Air Care) is a better solution for hospitality

How Air Care works: continuous air circulation + advanced neutralisation (ionisation / oxidation / filtration stages depending on model) breaks down odour molecules and reduces VOCs and microbial particles rather than just masking them.

Key benefits vs. scent-based products and traditional extraction

Practical “how to get rid of bad smell coming from toilet” checklist

• Check plumbing first: Verify P-traps have water, inspect seals/wax rings, check for clogged vents and drains.
• Remove reservoirs of organic matter: Clean under rims, inside tanks, grout and floor drains with enzymatic cleaners.
• Upgrade ventilation: Where possible, ensure exhaust fans and vents operate correctly.
• Install continuous purification: Use standalone or integrated Air Care units for constant VOC and odour reduction—ideal when ductwork is impossible.
• Avoid over-reliance on sprays: Use masking only as a temporary stop-gap, not a long-term strategy.
• Monitor & maintain: Regularly inspect drains, grout and traps; keep purifiers serviced per manufacturer guidance.

Ready to Clear the Air?

Let us help you! You can also have fresh, clean, and odour-free restrooms that enhance customer satisfaction and reinforce your brand’s commitment to a great dining experience. Get a Free Assessment 👇