Ships and cruise vessels are closed systems. Hydrogen sulphide (H₂S) from the drains can be deadly in the cabin or engine room. P-traps dry out due to tilt, vibration, and forgotten cabins. Green Drain™ is a mechanical one-way barrier that backpressure from the sewer does not open.
The vessel pitches, rolls, and vibrates. The P-trap isn't static. A P-trap in the cabin can empty due to water movement. Plus the enclosed space — H₂S that on land would escape through a window here accumulates in the cabins.
Croatian shipyards (Uljanik, 3. maj, Brodosplit, Trogir), maritime companies (Jadrolinija), the ACI marina network, and cruise terminals in Split, Dubrovnik, and Kotor represent significant market potential. MARPOL Annex IV governs the handling of sewage from ships, which is directly linked to the drainage system.
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.
The ideal time is during a regular ship dry dock. Cabins, washrooms and engine rooms are all fitted during the planned dry dock.
Review of vessel documentation and drainage systems — compliance with the classification society.
10 cabins and one engine room — pilot during the voyage.
The entire vessel is undergoing a planned overhaul.
The classification society records it in the ship's documents.
The Croatian maritime industry includes cruise ships, Jadrolinija (RoRo ferries, high-speed vessels), ACI marinas, and shipyards (Uljanik, Brodosplit, 3. maj, Trogir). Ship cabins are 50–58 mm standard, crew sanitary facilities and technical spaces are larger. Specific challenges: vibrations, salty atmosphere, MARPOL Annex IV.
Technical documentation and compliance with EN 1253 and NSF/ANSI 2 are submitted to the classification society during the audit. The specification is in line with the general approach for sanitary systems.
The seal operates mechanically — it's not like a P-trap that relies on water. Vibrations don't affect it. Tested in industrial environments with constant vibrations.
The silicone material is resistant to a saline atmosphere and UV. The external plastic frame is as well. Typical expected service life: about 5 years under marine conditions.
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 deck drains on ships, in marinas, and at ports. H₂S and odours for confined spaces, MARPOL Annex IV compliant.
Bio-enzymatic urinal tablets for shipboard washrooms and marinas. Without harsh chemicals that would contaminate the sea after discharge.
Bio-cleaning of drains in confined spaces. Disruption of biofilm without substances classified as MARPOL pollutants.
We come to the site, map the drains, and provide a written recommendation — no cost, no obligation.