I've been using a mix of 10% pool essentials from Walmart and 12.5% from local pool places to chlorinate, but when I got back from vacation, I found Walmart to be sold out for the season and the stock at the pool stores growing old. Understandable as it is the end of the season. I asked one store to order me an unbroken case in thinking it might be newer, 17060 was the date. I'm seeing like 1/3-1/2 of the FC I should be, so I guess I'm buying bleach for the next couple weeks till I give up on the pool for the year. Is walmart the best place? Dollar store? Grocery store? Is there a certain brand that's preferred? Or just the newest unscented not splashless I can find?