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).
WhereIsIt Catalog Group File. CTG file is a WhereIsIt catalog group file. Simple text files combining one or more WHereIsIt catalog files or other catalog groups into a selected group. This allows for easier one-step loading of predefined groups of catalog files for users with lots of catalogs. Detailed description not available.