... toxic, no heavy metal additives, directly apply to the water supply system.2. Corrosion resistant, not scaling, no rust, anti- ... liquid medicine.5. Solar heating and cooling equipment system.6. Piping system for air compression.7. Caliduct, floor and wall ... heating equipment.8. Piping system for other industries and agricultureMaterial:PPR (Hyosung,Borealis,Yanshan) ...