This is my 4th? 5th summer? With our above ground pool and I always struggle getting it open. I know that I need to upgrade from the test strips and I will do that, but in the meantime, I can't get my free chlorine level up. Admittedly, we added zero chemicals when we closed it last year and miraculously when we took the cover off, the water was fairly clear. I have an above ground pool with approximately 18,000 gallons and added 6,000 gallons of city water when we opened it last weekend. I've added 8lbs of shock and my free chlorine is still zero. All of my other numbers are low as well - pH, stabilizer, and alkalinity. I know that I need to get everything up, but clearly I'm doing it out of order. I've added chemicals to increase all of them, but the numbers aren't really going up. Any suggestions?