Although aesthetically displeasing, tannins do not pose a health issue. However, if tannins are found in the water, it can indicate that your water is significantly influenced by surface water. Put simply, this means that if tannins can travel easily from surface water to your groundwater source, pathogens can easily travel through as well.
JPG is a file extension for a lossy graphics file. The JPEG file extension is used interchangeably with JPG. JPEG stands for Joint Photographic Experts Group who created the standard. JPG files have 2 sub-formats, JPG/Exif (often used in digital cameras and photographic equipment), and JPG/JFIF (often used on the World Wide Web).
PRG is short for program.. Files ending in .prg contain code that can be run within another program. PRG files may be generated by several different programs, including software development and scripting applications. These programs may also compile PRG files into executable files.