I own a 17,500 gallon inground fiberglass pool in South Arkansas. Due to the cooler weather, I've been slacking with my tests. The other day I decided to test my pH and I got a very reddish color...one that doesn't fit into the color spectrum on the test vial. I assumed my pH was extra high, so I started adding muriatic acid. To make a long story short, I've added almost a full jug (the one from Home Depot that comes in packs of 2) and I'm still getting that same color. Is it possible that my pH is still high and I need to continue adding acid, or is there something else throwing my test completely off? I've never had this problem before and have always gotten a reading that falls within the color spectrum.