BEST ANSWER:When you’re filling the bladder with water, air will be trapped at the top. Pressing the button will release the air, and the first stream of water will tell you that the bladder is filling with water.
BEST ANSWER:When you’re filling the bladder with water, air will be trapped at the top. Pressing the button will release the air, and the first stream of water will tell you that the bladder is filling with water.