I have a fairly simple straight forward question about using Spa Sentry. I just drained and refilled my spa and I used the Spa Sentry product to get things going to start it up. Question is how long do I need to wait before getting in the hot tub and using it?? I have added nothing else at all to the water. Water test fine. Do i need to wait 24 hrs? Thank you for the help. Sorry if this a noob question. Mark