A university campus means dozens of buildings — laboratories, dining halls, halls of residence and sports facilities. The estates team cannot hand-check every trap over each summer shutdown. Green Drain™ covers the whole network through one standardised procurement.
Universities in Zagreb, Split, Rijeka, Osijek, Zadar, and other cities. Each building has its own technical service, its own solutions, its own local practices. Standardisation is difficult.
According to the Croatian Bureau of Statistics, 147,454 students were enrolled in higher education in the winter semester of the 2024/2025 academic year, 14.9 % of them at polytechnics and colleges and the remainder at universities. Each campus has dozens of facilities with seasonal summer operations — from canteens and dormitories to laboratories.
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.
Campus estates teams adopt the specification, and it is rolled out over three to five summers, priority buildings first.
The campus maps all buildings and estimates the number of drains by building type.
One building (e.g. a dormitory) — pilot installation, one-season evaluation.
Central procurement — ASSE 1072 specification, delivery within 3 years.
The technical service is installing them in each building during the summer work.
Croatian university campuses consist of faculties (new and old buildings), student dormitories, canteens, and sports facilities. Standardisation across the campus portfolio means a mix of all sizes — but GD 2 dominates because most sanitary fittings are 50–58 mm.
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 halls of residence, colleges, dining halls and laboratories. ASSE 1072-2020 specification for public procurement and BIM documentation.
Bio-enzymatic urinal tablets for washrooms in faculty buildings and student housing. One standard across the whole campus and fewer service call-outs.
Biofilm cleaning in the sewer systems of dining halls, laboratories, and sports facilities. Chemically neutral, compatible with laboratory processes.
We come to the site, map the drains, and provide a written recommendation — no cost, no obligation.