Supply of water at public drinking fountains, etc. not to be taxed.

No tax or charge of any kind shall be levied or demanded for the use of water in or from any drinking fountain, tank, reservoir, cistern, pump, well, duct, stand-pipe or other work used for the gratuitous supply of water to the inhabitants of the City and vesting in the Corporation: Provided that the water in or from any such work shall be used only for personal or domestic purpose and not for the purpose of business or sale. 2[Provided that if the Corporation shall have determined for any official year any different rate of a conservancy tax for any class of properties to which any of the properties referred to in this sub-section belongs, the Commissioner shall not, without the previous approval of the Corporation, fix, for such offical year or part thereof, the conservancy tax to be paid in respect of any property belonging to such class for which such different rate may have been determined by the Corporation, at any other different rate under this sub-section.] (2) In the case of premises used solely for public purposes and not used or intended to be used for purposes of profit or for residential or charitable or religious purposes in respect of which the conservancy tax is payable by the 3[Government] the Commissioner shall fix the said tax at a special rate approved as aforesaid. (3) In any such case the amount of the conservancy tax shall be fixed with reference to the cost or probable cost of the collection, removal and disposal, by the agency of municipal conservancy staff, of excrementitious and polluted matter from the premises.