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.
Nuts and Seeds. Nuts and seeds have moderate amounts of protein, and they are also high in fat and fiber. Sprinkling sesame, sunflower or flaxseeds across prepared collard greens is a good way to make them complete proteins. You also have the option of using chopped almonds, walnuts, pecans or some other form of nut.