hey ppl, i was jus googlin how to purge these cockles for a feed and came across this on a sydney fish market site, i will see if it works as i totally forgot to get some sea water when i was there...hope it works and helps some others..."If they haven’t been purged, place them in a solution of cool water and sea salt (30g salt to each litre of water) for several hours, or overnight, in a cool part of the house (if you refrigerate them they’ll close up and won’t ‘spit out’ the sand). The shells yield an average of 20-30% meat, so allow around 600g of whole she