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Blog & Resources · Green Flow

Knowledge that
protects your facility.

Expert articles, case studies, technical guides, and resources on drain hygiene for hotels, hospitals, the food industry, and facility managers.

Featured article
01
🏥 Healthcare
7 April 2026
6 min read
Case study

Hospital drains as a source of infections — what IPC programmes overlook

Fifty-eight peer-reviewed studies link floor drains in healthcare facilities to reservoirs of Pseudomonas aeruginosa, Klebsiella pneumoniae and NDM-producing organisms. Why infection-prevention programmes keep missing them, and what Croatian hospitals can do about it.

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Green Drain™ Infection control Case study Hospitals
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O
Drains
11 August 2026·5 min

Grease in kitchen drains — why it comes back and how to get rid of it

Hot water does not solve the problem, it only moves it further down

P
Urinals
4 August 2026·4 min

Waterless urinals — how much they save and how they are maintained

The water saving is real, but maintenance changes from the ground up

O
Drains
28 July 2026·4 min

Why caustic soda destroys the pipes it cleans

What breaks down the blockage does not stop at the blockage

P
Urinals
21 July 2026·4 min

Urine scale — why urinals block from the inside

A blockage is the last step in a process that takes months

O
Drains
14 July 2026·5 min

Blocked drain — what to do before you call someone out

The order of operations that does not wreck your pipes

P
Urinals
7 July 2026·5 min

Why a urinal smells even when it has just been cleaned

The odour does not come from the ceramic, it comes from the drain

B
Healthcare
16 June 2026·4 min

Odour and sewer gases from hospital drains — protecting patients and staff

The same dry trap that lets odour through lets bioaerosols through too

A
Hotels & HoReCa
9 June 2026·4 min

Drain smell in a hotel room — cause, reviews and a permanent fix

The room is spotless, and the guest still writes “it stinks of sewage”

D
Home & Living
2 June 2026·6 min

Drain smell from a bathroom floor drain — causes and how to fix it for good

Usually it is not about cleanliness — it is a dried-out trap

C
Tourism & Rentals
26 May 2026·5 min

Drain smell in a rental apartment — why it happens and how to fix it for good

An empty apartment, a dried-out trap, and the first thing the guest notices

01
Technical
19 May 2026·8 min

Plumbers recommend: a passive seal with a five-year life and 30-second installation

Drop-in design, no tools, no changes to the existing pipework — what specialists on site make of it

02
FM & Property
12 May 2026·9 min

ROI: passive floor drain protection — a calculation for Croatian sites

A four-step framework for facility managers, based on real costs in Croatian hotels and hospitals

03
General
5 May 2026·8 min

Biofilm in the sewer — why bleach is not the answer

Chlorine kills surface bacteria in 60 seconds. The biofilm underneath regenerates within a few hours.

04
Food Industry
28 April 2026·6 min

HACCP and drains in the food industry — the CCP everyone forgets

BRC and IFS audits increasingly ask for a documented drain control plan

05
Schools
21 April 2026·8 min

Why schools smell of sewage on the first day of September

7 weeks of summer + the winter holidays = every trap is dry

06
Healthcare
14 April 2026·7 min

EU MDR Class I for hospital equipment — what it means for procurement

A guide for procurement officers, design engineers and technical departments in Croatian university hospital centres (KBC)

07
Healthcare
7 April 2026·6 min

Hospital drains as a source of healthcare-associated infection — what IPC programmes often miss

58 peer-reviewed studies link drains to pathogen transmission

08
Hotels & HoReCa
31 March 2026·7 min

Seasonal closures in Adriatic hotels — even empty rooms smell

Six months closed, five years of reviews

09
Restaurants
24 March 2026·8 min

Drain flies in kitchen drains — why chemicals do not solve it

Pest control call-outs keep repeating because nobody closes the source

10
General
17 March 2026·7 min

What a P-trap is, and why it dries out when a building stands empty

A small amount of water you should not underestimate

Technical Resources

Documentation
and guides.

SDS sheets, technical specifications, installation guides, and certificates — all in one place.

📄
Green Drain™ — Safety Data Sheet
Complete SDS document in accordance with EU regulations. Chemical composition, safety data, disposal.
📥 PDF · 420 KB
📄
GreenSwirl™ — Safety Data Sheet
SDS for sodium hydrogen sulphate granules. pH ~2, density 2.74 g/cm³, VOC 0 %.
📥 PDF · 380 KB
🔬
SGS Laboratory Test — Green Drain™
>99.9 % blockage of viral aerosols. Independent testing, methodology, and results.
External link
Installation Guide — Green Drain™
Step-by-step installation for every size. Thirty seconds per drain, and nothing to maintain afterwards.
📄 DOC · 1.2 MB
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Certificates & standards
SGS HACCP NSF/ANSI 2 CE cUPC WRAS ISO 9001 7 more
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