It is quite normal to lose some water from your swimming area. The water loss could be as a result of various issues such as water splashing out during the process of swimming, evaporation process especially during the sunny times and also during the process of back cleaning your filter. You thus should not be worried in instances of such small water loss processes. However, if you seem to be losing some high capacity of water, you should probably investigate whether it could be due to leaks. Below are some of the pool leak detection Orange County, CA pointers to note.