I don't know the labels/brands that come from Odyssey, but Hasa sells direct to stores as the Hasa brand. Hasa has dealers on this map mostly in California, Washington and Arizona with some in Oregon, Nevada, Utah, Texas and Kansas. They have facilities (plants) shown in this map in California, Washington, Arizona and Texas. It's filtered sodium hypochlorite. You are right that there are many brands (such as Kem-Tek) and they are not manufacturers of chlorinating liquid themselves so it's hard to know the quality of their products. PPG has four facilities though they boast about volume and are silent about quality. This page has some interesting links from Powell on their chlor-alkali process.