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By certification 
Standards:
EN ISO 21003 - Multilayer piping systems for hot and cold water installations inside buildings
ASTM F1281 - Standard Specification For Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene (PEX-AL-PEX) Pressure Pipe.
BRL-K536 E - Plastics piping systems of PE-X/Al intended for the transport of cold and heated drinking water
DVGW W 534 (P) - Pipe Connectors and Pipe Joints in Drinking Water Installation
DVGW W 542 - COMPOUND PIPES IN THE DRINKING WATER INSTALLATION; REQUIREMENTS AND TESTING
DVGW W 270 - A method for the assessment of enhancement of microbial growth on non-metallic materials in contact with drinking water
UBA KTW - about Hygienic property of material odor test
UBA ELASTOM - Guideline for hygienic assessment of elastomers in contact with drinking water
AS 4176.2 & 3 - Multilayer piping for pressure applications - Multilayer piping systems for hot and cold water plumbing applications- PIPES & FITTINGS
XP P41-250 - Effect of materials on the quality of water intended for human consumption - Organic materials
NSF /ANSI /CAN 61 - Health Effects of Drinking water system components
Certificates:
AENOR - refers to EN ISO 21003
QB - refers to EN ISO 21003
KIWA - refers to BRL-K536 E
UBA ELASTOM
ACS - refers to XP P41-250
WaterMark - refers to AS 4176.2 & 3
WRAS - refers to Regulators’Specification
ISO 9001:2015 – "Quality management system"
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