1 In general, the total dissolved solids concentration is the sum of the cations (positively charged) and anions (negatively charged) ions in the water. 2  Parts per Million (ppm) is the weight-to-weight ratio of any ion to water.  A TDS meter is based on the electrical conductivity (EC) of water.
Collard greens may be worth considering for health additions to your diet. These dark-green leafy vegetables provide iron, vitamin K, folate, calcium and the antioxidants lutein and zeaxanthin. They may even help you prevent gout or reduce your symptoms when you eat collard greens in moderation as part of a healthy diet.
Collard greens contain a wide array of nutrients. Collard greens, long a staple of down-home Southern cooking, are largely overlooked by chefs and consumers outside the South. Considering the nutritional riches contained in collardsâ dark green leaves, itâs unfortunate that more Americans arenât consuming them on a regular basis.