Itislikeametalloricaefortheplasticwhichcanisolatetheexterioraircompletelyandkeeptheliquidmediuminsidethepipingsystemawaytheoxygenandthelight,consequentlyitcanrestrainthegrowthofalgaebacteriatoguaranteethewaterquality.WhenPP-Rstablestaticpipesareusedforthecentralairconditionerandheatingsystem,theycanpreventthemetalequipmentfromoxidationanderosion.