I love going to the pool store just to mess with their minds. First I take in a sample of water. Have them test it and listen to their speel about what chemicals I need to buy to get my pool balanced. Leslie's is by far the funnest place! Then I poke around the store for a bit and ask them where they sell the liquid shock, borax and baking soda. Their eyes just about roll in the back of their head. When the store manager tells me they don't sell these items, I tell them I'm headed to Walmart then.