Bean sprouts will remain fresh longer if you store it in the fridge in salt water.
Bean sprouts remain fresh longer if you remove the tails of purchase (the brown stringy part) and then place in a large bag (for example, a pedal bin liner) or a large tray covered with plastic film stored in the refrigerator. The tails namely spoil the fastest and ensure that everything feels very sticky. And especially do not wash the bean sprouts !!! Beware wash before use.