Hello! New to the industry. Draining a pebble tech for the first time and doing a lot of research so I don’t mess up. I’m hearing a lot about a drain plug but when I research pebble tech and drain plug, I can’t seem to find anything. Is there a drain plug on pebble tech pools? I’m draining overnight, cleaning it up and chlorine washing (green pool) the next day and then filling. Shouldn’t be empty for more than 24 hours. Thank you for whatever advice you can give.