Every claim backed by independent testing.

Pathogen control testing.

The most critical question for any drain seal device: does it actually block pathogens from passing through? Green Drain answered this question with independent laboratory testing at SGS-CSTC, one of the world's largest testing and certification organizations.

SGS viral aerosol retention test

SGS conducted a viral aerosol retention test on the Green Drain GD3 under Report QDF25-0049810-01. The test used MS2 bacteriophage (ATCC 15597-B1), a non-pathogenic virus widely accepted as a surrogate for human respiratory and enteric viruses in aerosol transmission research. MS2 is structurally similar to many clinically relevant pathogens and is the standard choice for evaluating physical barriers against viral aerosol penetration.

Test protocol and results

The test was conducted over three rounds. In each round, aerosolized MS2 was introduced below the drain device, and air sampling above the device measured the number of plaque-forming units (PFU) that penetrated through.

• Control (no device installed): 18,000 to 72,500 PFU detected above the drain opening
• With GD3 installed: Below detection limit (<5 PFU) in all three rounds
• Retention rate: Greater than 99.9% across all three test rounds

These results mean that out of tens of thousands of viral particles aerosolized below the device, fewer than 5 made it through the Green Drain barrier. The test was conducted under CNAS L0604 accreditation, the Chinese National Accreditation Service for Conformity Assessment, ensuring laboratory competence and result traceability.

Why this matters for specifiers

Many products claim to "block sewer gas" or "prevent odors." Those are subjective descriptions. The SGS test provides a quantified, reproducible measure of pathogen aerosol retention using a validated viral surrogate under accredited laboratory conditions. This is the data point that infection preventionists, healthcare architects, and facility managers need when evaluating drain seal technology for sensitive environments.

Pressure and odour tightness testing.

A drain seal must maintain its barrier under the pressure differentials that occur in real plumbing systems. Wind loading on a building, HVAC pressure, stack effect, and sewer pressure fluctuations all create forces that push against the drain seal. Green Drain has been independently tested for both odour tightness (low pressure, sustained) and mechanical resistance (high pressure, burst).

DTI Report 226049: European Assessment

The Danish Technological Institute (DTI) tested Green Drain under EAD 180020-00-0704, the European Assessment Document for waterless trap seal devices. Key results:

• Odour tightness: 200 Pa with zero pressure drop. The device maintained a complete seal at 200 Pascals of sustained positive pressure with no measurable air leakage through the valve.
• Mechanical resistance: Exceeding 700 Pa for most models. This is the pressure at which the valve begins to allow air passage, well above any pressure differential encountered in normal building operation.

DTI Report 957187: Vacuum and pressure resistance

A separate DTI test evaluated the device under both positive pressure (sewer gas pushing up) and negative pressure (vacuum pulling the valve open). Results confirmed resistance exceeding 400 Pa in both directions. This means the device holds its seal whether pressure is pushing up from below or pulling from above, covering the full range of real-world plumbing pressure scenarios.

What these numbers mean in practice

Building plumbing systems typically experience pressure differentials of 25 to 100 Pa during normal operation. Extreme conditions (high winds, stack effect in tall buildings, simultaneous fixture use) might produce 150 to 250 Pa. Green Drain's tested resistance of 400 to 700+ Pa provides a substantial safety margin above any expected operating condition.

Thermal cycling and lifecycle testing.

Single-point material testing tells you how the silicone performs today. Lifecycle testing tells you how it performs after years of repeated stress. Green Drain has been subjected to extensive thermal cycling and mechanical lifecycle testing by both DTI and IAPMO to verify long-term performance.

DTI thermal cycling

DTI subjected Green Drain to over 1,500 thermal cycles, alternating between 93C (199F) hot water and 15C (59F) cold water. After 1,500+ cycles of extreme thermal shock, the device's self-cleaning capability was maintained. The valve continued to open and close properly, and the seal integrity was preserved. This simulates years of hot water washdown in commercial kitchen and industrial environments.

IAPMO lifecycle testing

Under ASSE 1072-2020, IAPMO requires lifecycle testing to verify that the device maintains consistent performance over thousands of open-close cycles. Green Drain completed 2,500 cycles, which is the ASSE 1072 requirement. The opening force remained consistent at 32 grams across the full lifecycle test. This means the valve requires the same minimal force to open on cycle 2,500 as it did on cycle 1. There is no stiffening, no fatigue, and no change in seal behavior over the tested lifecycle.

What this means for building owners

A drain seal device in a commercial building may experience multiple open-close cycles per day. In a restaurant kitchen, that could be dozens of cycles during a single shift. The combination of thermal cycling (extreme temperature swings) and mechanical lifecycle testing (thousands of open-close cycles) provides confidence that the device will perform consistently over its installed life without requiring scheduled replacement.