I recently had a pool built it is 33x17 in ground shotcrete pool depth is 3 1/2-5-4. When it was finished I noticed that it was losing water pretty rapidly 1/2-1 inch per day in December. They found leaks in 2 returns, they fixed them and no leaks there with a dye test now. I filled my pool last Saturday and now a week later it is down about an inch. What is a normal evaporation rate? Do you think I have a small leak somewhere or is this normal?