1, the choice of flower armor to choose a large, complete shell tightly closed, which must be live.

2, the flower armor in the still water will stick out a little tongue, with the hand touch the flower armor sticking out the tongue, will automatically shrink back, is alive. Flower armor in the still water extends the tongue is too long, the shell has been half-open state, even the body has a part of the shell outside, with the hand to touch the flower armor extends the tongue will not shrink back, is dead do not choose.

3, in the selection process is generally a one by one selection, hand weighing, generally the weight of each flower armor is about the same, if lighter than usual is certainly empty shell; on the contrary, it may be loaded with sediment, do not choose.

4, if the time is relatively spare, you can fill the basin with warm water, put the oil and salt, stand two to three hours later, you will see most of the flower armor are open the shell, and the water is turbid. At this time the flower armor to remove the sand step is complete.