What 's the best way to descale these pipes ?

给这些水管除垢的最好方法是什么？

To break electronic bonding force of scale molecular so its crystal structure changed , the hard scale softened and then flaked off gradually , to achieve the function of descale .

破坏垢分子的电子结合力，改变其晶体结构，使坚硬垢变为疏松软垢，使积垢逐渐剥落，起到除垢作用。