Hi Zyaad,  The sludge that ...

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Hi Zyaad,  The sludge that forms on the inside of the pipes is CaO that also has formed CaCO3 component. Since CaOH (lime) is a slurry, the CaOH deposits on the walls of the pipes which in turn reduces the orifice over time. To Clean out the pipes - a mild acid would work or you could use Calcium Chloride with NaOH.  We've found this as a great replacement and it does not clog the pipes.