Hello All, My new spa start up kit (BioGuard) states that I should fill the spa for the first time and then add a superchlorination dose of Chlorinating Concentrate...run for two hours and then drain, clean, and refill. The spa (2004 -Hot Spot Sorrento) has never been used (no water ever) and has been cleaned with Windex , has always had the cover on and is spotless. Any ideas? Thank You.