Earlybirds JP 3 This product didn't work. Tested it over night (to avoid direct sunlight harming the chlorine's performance) in our 14 x 48 pool for 8 hours. The free chlorine levels had no/zero increase by the morning.The language used on the label is also strange and ambiguous. If the company can't even label the bottle correctly how can you trust what they put into their product. Complete waste of time and money.