The quantity recorded by the meter shall be considered the amount
of water passing through the meter, which amount shall be conclusive
on both the applicant and the Department, except when the meter has
been found to be registering inaccurately or has ceased to register.
In such cases, if the meter is found to be reading fast, the customer
will be billed the minimum charge for the period in question. If the
meter is reading slowly, the actual reading will be used but will
never be less than the minimum allowance.