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 restrooms. The traps dry out in 5–10 days. After seven weeks, 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 — EU 2017/745 (MDR), EU 178/2002 (food safety), EU 1935/2004 and EU 10/2011 (food contact materials), EU 528/2012 (BPR), EU 2014/34 (ATEX). Standards: EN 1253-1 (floor P-traps, water seal ≥50 mm), EN 1253 Parts 6/7/8 (mechanical seal failures, 2023), HACCP Internacional RG-04, ASSE 1072-2020, NSF/ANSI 2. 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, restrooms, kitchen, and gym.
Written proposal for the principal and technical services. It also covers dormitories, if any.
We are placing three samples in critical sanitary areas. The technical service is assessing.
Half a day of work — performance in the week before classes begin.
Croatian schools are built according to EN 1253. Most elementary schools built after 2000 have DN50 traps in the restrooms. Older buildings (1950–1980) have a mix of DN65/80. Gymnasiums always have larger traps (DN80–100) 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™ (cleaning).
Patented silicone seal for all floor drains in school restrooms, kitchens, and gymnasiums. Remains sealed through a seven-week summer without use.
Bio-enzyme urinal tablets for public school restrooms. Fewer odours, fewer parent complaints, simple maintenance by the janitor.
Bio-cleaning of kitchen and locker room drains. Breakdown of organic buildup in cafeterias and sports halls — a safe formula for school environments.
We come to the site, map the drains, and provide a written recommendation—no cost, no obligation.