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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.

Read the article →
Green Drain™ Infection control Case study Hospitals
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Home & Living
29 September 2026·5 min

Drain smell returns after cleaning — why

Three causes look identical. Half a litre of water tells you which one you have and what actually helps.

MM
Home & Living
17 September 2026·4 min

Which floor drain seal size do I need

Measure the pipe below the grate, not the grate. Table from 32 to 156 mm and what to do between sizes.

€
Home & Living
8 September 2026·5 min

What it costs to fix drain smell for good

€39.99 per drain and a five-year life — about €0.67 a month. The arithmetic for a flat and a house.

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

07
Healthcare
7 April 2026·6 min

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

23 documented hospital outbreaks linked to drains (Carling, 2018)

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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