Never tie down or restrain an exorcee. It is illegal. This again is an indication as to who you think is the mediator. Water dissipates the power of an Evil Spirit. Add some sea salt to the pool.
Unclean spirits hate salt and water.
We are the salt of the earth. Water is God's curse for fallen angels and demons. He destroyed them sending them into the sea. Jesus made the angels out of the fire from lightning. You know what lightening does when it hits water.