Accordingly the invention consists in a dispenser comprising a bag or sachet having a wall, through which liquid may pass, {HEAD ~ material} within said bag or {TAIL ~ sachet} being able to dissolve or be subjected to a leaching action in a selected liquid so as to release a selected material into said selected liquid 
within
Accordingly the invention consists in a dispenser comprising a bag or sachet having a wall , through which liquid may pass , { HEAD ~ material } within said bag or { TAIL ~ sachet } being able to dissolve or be subjected to a leaching action in a selected liquid so as to release a selected material into said selected liquid
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