I'm new to TFP and these forums. I've had my pool for four years (in ground, vinyl, 13,000 gallons). I've been taking samples to local stores for testing but I'm getting so frustrated! After two weeks of adding shock and chlorine, my pool still has no free chlorine, it's super cloudy and the pH is too low. I'm tired of running my samples to the store, being told to add 8 bags of shock and nothing is happens. I'm ordering a testing kit but haven't got it yet.