Hi Todd,
I see you bought a 3-pack of Purple GI-D balls back in January. Each ball type that you see in the pro shop has a "Durability" rating displayed and much like real golf durability represents the amount of times the ball can be struck before it's taken out of play. The higher the durability rating (more bubbles on the chart) the longer each individual ball will last. This is explained in our FAQ, but for ease I've pulled out the relevant info for you.
Each ball's durability is represented in HITS graphic to the right of the ball.
As the ball is depleted and nears the end of it's life-cycle the meter turns red to let you know it's about to be taken out of play.
If you hit a ball in the water then it's gone completely, no matter how many hits you had left on it.
Please be sure to note durability in the future and just so you are aware, you are supplied with an endless amount of WGT Starter Balls if you choose to go that route instead.
Hope that helps.