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I've posted on this exact phenomena WRT factory built plastic encased hot tubs.

In both instances you're pumping ionized water past an electric field.(Plastic => unshielded -- no Faraday cage effect -- factory may not provide a current bleeder strap)

The introduction of mass-produced plastic systems that circulate water have got electricians, world-wide, running around looking for 'leaking electrons.'

Folks, these are de-facto feeble electrical generators (wavy DC) that pump juice directly into the (insulated by plastic) water -- ionized water, that is.

A L L water supplies are going to be 'ionized water'. Some level of (ionized) mineralization will exist. Typically, that mineralization is Calcium ion: Ca++.

When that happens, it's said that the water is 'hard.'

Galvanized pipes use Zinc (Zn) as a sacrificial metal to sheild Iron.(Fe)

Once DC current is induced into ionized water, the zinc is 'burned off' and then an attack against the iron begins. These show up as pin hole leaks because the electro-chemistry favors strees points -- especially where micro particles of Carbon interrupt the iron.

( Iron + Carbon = Steel; the ratio counts, huge.)