The school closes on June 21 and reopens on September 1. Seven weeks without water through the drains — every drain trap in the school is dry. First week of classes: the whole school stinks, fruit flies in the kitchen, teachers calling for the maintenance staff. Green Drain™ solves the classic problem.
No children, no kitchen, no use of the washrooms. A trap with no water flowing through it runs dry within two to four weeks, so after seven weeks of holidays practically every one is dry. Odours build up, flies multiply in the biofilm, and on the first day of September it all greets the teachers and the children.
According to the State Statistical Office, Croatia has 891 elementary schools (with 1,062 branch schools) and 447 secondary schools with 770 school units. That's over 1,300 facilities that close seasonally — all of them facing the same problem of dried-up drains.
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.
Ideally: the end of August, before classes start. A typical school — half a day's work for one technician.
The technician maps all drains throughout the facility — classrooms, toilets, kitchen and sports hall.
A written proposal for the principal and the maintenance team, covering boarding accommodation where there is any.
We fit three samples at the critical points and your maintenance team judges the result.
Half a day's work, carried out in the week before term starts.
Croatian schools are built according to EN 1253. Most elementary schools built after 2000 have 50–58 mm traps in the washrooms. Older buildings (1950–1980) have a mix of 55–65 mm/80. Gymnasiums always have larger traps (75–85 mm–100) due to shower stalls for over 20 students at the same time.
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 every floor drain in school toilets, kitchens and sports halls. Remains sealed through a seven-week summer without use.
Bio-enzymatic urinal tablets for school toilets. Fewer odours, fewer complaints from parents, and an easy job for the caretaker.
Biological cleaning of kitchen and changing room drains. It breaks down organic build-up in canteens and sports halls, with a formula that is safe around a school.
We come to the site, map the drains, and provide a written recommendation — no cost, no obligation.