Accordingly the invention consists in a dispenser comprising a bag or sachet having a wall, through which {TAIL ~ liquid} may pass, material within {HEAD ~ said bag} or 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 
Accordingly the invention consists in a dispenser comprising a bag or sachet having a wall , through which { TAIL ~ liquid } may pass , material within { HEAD ~ said bag } or 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
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH