Let me start by saying I am new to pool ownership. I have been all over the TFP site and have read and reread Pool School. I recently bought a FAS/DPD testing kit as recommended. I live in an area of southern Nevada known to have extremely alkaline water. I have been trying in vain to lower the alkalinity of my pool which currently stands at 250 ppm. Overt the last three days I have added a gallon of muriatic acid little effect. I am worried that adding more will damage the vinyl liner of my pool. My CYA is currently 95, PH is 7.3 (from adding all that acid) and FC IS 2.2, which I know is low but seems to be the least of my worries at the moment. I have enough salt and my CH is 250. Confusion reigns! Help!