I just filled my 1.1 acre pond this past fall with well water and have been keeping it full with canal water that comes from the Gila River. After reading one of the recent articles from the Pond Boss magazine on water lilies I planted some last fall just after the pond was full using 40 gallon plastic feed troughs as planters (the pond was built with a liner). This spring I kept waiting for the lilies to take off but they never did, I could see that they were still alive, but they were not sending up any new growth, they were staying with their winter leaves and not sending up any pads. After closer inspection by breaking off a leaf the plant looks like it is barely holding on. I did a PH test on the water and it is reading at the 9 level. What is the best method of lowering the PH? Acid? If so how much acid and what kind for a 1.1 acre pond that is about 13 feet at its deepest? I think that once treated it will be ok since I am now useing river water to keep full. Any help/advice would be great.