The airport operates 24 hours a day. Closing for P-trap maintenance is impossible. Seasonality (Split, Dubrovnik, Zadar — summer peak) puts operators under extreme strain. Green Drain™ solves the problem of unpleasant odours and hazardous gases — with no need for reintervention for years.
The terminal operates 18–24 hours a day. The hangar and technical support are available around the clock. The passenger washrooms in the terminal are heavily used during the day but not at night, when the drains can dry out.
According to the DZS and official airport data, a record 13.2 million passengers passed through Croatian airports in 2024. The highest traffic was at Zagreb, Split, and Dubrovnik. Zadar recorded growth of nearly 30 % in 2024. Seasonality is a structural challenge, especially for coastal airports.
Statistical data were taken from official sources: State Statistical Office (data.dzs.hr) Croatian Institute of Public Health (hzjz.hr), Ministry of Labor, Pension System, Family and Social Policy (mrosp.gov.hr), Agency for Science and Higher Education (azvo.hr), Ministry of Tourism and Sports (mint.gov.hr). Regulatory framework: EUR-Lex for EU directives and regulations — Regulation (EU) 2017/745 (MDR), Regulation (EC) No 178/2002 (general principles of food law), Regulation (EC) No 852/2004 (food hygiene — HACCP obligation), Regulation (EC) No 1935/2004 and Regulation (EU) No 10/2011 (food contact materials), Regulation (EU) No 528/2012 (BPR), Directive 2014/34/EU (ATEX). Standards: EN 1253-1 (floor P-traps, water seal ≥50 mm), EN 1253 Parts 6/7/8 (gullies with a water seal below 50 mm, with mechanical closure, and combined types; 2023 editions), ASSE 1072-2020 (floor drain trap seal protection devices) and NSF/ANSI 2 (food equipment). HACCP International RG-04 is a private certification programme operated by HACCP International, not an official certification issued by a public authority. Tourism data taken from the DZS publication for H1 2025, healthcare data from the HZJZ report 2024, data for education from DZS publications for the 2023/2024 and 2024/2025 school years, data for nursing homes from the MROSP report, and announcements of EU-funded construction in 2025. Revision date: May 2026.
Large airports have a 4–6-hour night-time low-traffic window. Our technicians work in zones escorted by security.
The technician is mapping the terminal, the hangar, and the customs area — accompanied.
One sanitary or customs zone — 30-day evaluation.
Include the airport technical service in the maintenance system.
By zones during the night slots — one zone = one night.
Croatian airports (Zagreb, Split, Dubrovnik, Pula, Zadar, Rijeka, Osijek, Brač + Mali Lošinj) have structurally distinct zones. Passenger sanitation areas are predominantly 50–58 mm. Business lounges and wellness zones are in the more luxurious BC size. Hangars, MRO workshops, and cargo zones are industrial in scale.
Green Drain™ doesn't work alone — for maximum drain control it's combined with GD Uri-Tabs™ (urinals) and GreenSwirl™ (drain unblocking).
Patented silicone seal for all terminal floor drains. The seal protects during low-flow periods at night and shields passengers from H₂S.
Bio-enzyme tablets for all urinals in the terminal — high daily throughput from a 24/7 operation. Fewer service interventions during peak hours.
Bio-cleaning of biofilm in the terminal and ground-floor washroom facilities. Reduces seasonal odours in waiting rooms and the food court.
We come to the site, map the drains, and provide a written recommendation — no cost, no obligation.