Hi, I am a new member. I live in Central Illinois, near Pekin, Il. I live in the country. I have well water that seems to cause me problems with my pool. I have an above ground 24' round pool, about 14K gallons. I have a 1hp sand filter(150lbs). I have been using Trichor pucks for chlorine, but I am going to start using the sodium hypo. as Menards now has the 12.5% gallon jugs for 1.99.