The present invention provides a feeder for dispensing a solution of at least partially dissolved solid matter therein, comprising (a) at least one container wherein said container enclosing a bulk M of solid matter (b) at least one feeding pipe, in fluid connection with said container, adapted to introduce a stream L of flowing liquid into said container wherein a portion P of said bulk of solid matter is at least partially dissolved within said liquid such that said solution is provided wherein P is substantially smaller than M.
