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).
The .jpg file extension is assigned to image files. Many photographs and Internet graphics are stored in the JPG file format. JPG files are commonly referred to as JPEG images. JPEG is the acronym for Joint Photographic Experts Group. Many bitmap images are saved in .jpg format in order to compress the files.