Well duh, just paint it !!...
seriously , muriatic acid.
water and baking soda mix in bottom 2", then neutralize walls with mix.
deferring to ? @Projects with Sam or anyone w exp using on tank,
I have only used cleaning water holding tanks...

seriously , muriatic acid.
water and baking soda mix in bottom 2", then neutralize walls with mix.
deferring to ? @Projects with Sam or anyone w exp using on tank,
I have only used cleaning water holding tanks...

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