Just started filling the pool. There's about a cup of water leaking out about every two hours. Pinhole, i reckon. I've currently got it about 1.5 deep. Should I find the leak now, or wait till it's full? I noticed the leakage when it was about 8"deep. dropped food coloring into the water trying to track it down. no luck. Thought I'd get better results with more water (i.e. pressure) in the pool. So, try more food coloring now, or wait til it's full?