Salt accumulating in bottom of pool

[raychl25]

We are in Chandler, Arizona, and we have a salt water pool. A couple days ago we noticed that a pile of salt had accumulated in the bottom of the pool, so we brushed it and cleaned it out. Today, there is again a pile of salt in the bottom of our spa.
We are new to the area (and to having a pool). Anyone know what could be causing this and what we should do?

[PoolGuy]

check your system and see if you over filled it. or if you need to get a "o" ring for it.