Seet Mei, if you are asking if you can recycle the moss for use with other orchids, I would advise you against it..after a duration of time, the moss would have picked up all kinds of contaminants and other detritus not to mention the very real possiblity that if the original orchid was infected with something it could spread to another plant which you are now recycling the moss for. Remove the old spaghum moss and either throw it away or you can use it as part of your compost if you do your own compost but in my humble opinion never recycle old media..