3. References to spray irrigation in those provisions of the Water Resources Act 1991 that are specified in the Schedule hereto shall be construed as not including spray irrigation if carried out—
(a)by means of a combination of water and substances used for protecting plants against pests or disease or for exterminating or restricting the growth of weeds or grass and emerging from apparatus that is moveable;
(b)by means of a combination of water and growth regulators or nutrients emerging from apparatus that is moveable;
(c)by means of a combination of water and manure or dung—
(i)emerging from apparatus that is moveable, or
(ii)emerging from spray guns insofar as the water used by such guns in any period of 14 days does not exceed the aggregate capacity of the effluent pits or tanks situated on the holding from which the manure or dung is derived; or
(d)by means of a combination of water and quality additives emerging from apparatus that is moveable.