Hi Oscar and welcome to the forum! I'm going to let one of the equipment gurus help you with your problem, but I just want to caution you about something.

I have no idea what kind of pool class you are going to attend, but do not let anybody talk you into buying any products while you are there until you run it past us first. Pool stores are notorious for selling unsuspecting pool owners products that are expensive and that they don't need. Just a heads up for you!