I have about 1/3 of gallon of liquid stabilizer, but I have lived here for two years, and this was left by previous owner. I imagine it is probably no good, but because of the current price of liquid stabilizer, want others opinions whether I can still use this. I am in Arizona, so this has sat in garage in heat and cold for who knows how long before I bought house 2 years ago. The product is Natural Chemistry Instant Pool Water Conditioner , Easy pour liquid stabilizer, and the printed number on bottle is # 0282022. I believe this is the same stuff that Leslie's sells, but when I asked about the expiration number on it, they didn't know what to say. Should I use, and if so, do I just pour in skimmer basket?