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.
Mustard Greens. If you need more Vitamin E in your diet, try eating more mustard greens. One cup of chopped greens contains 1.13mg of essential Vitamin E, along with many other nutrients. In fact, mustard greens are a great food to enjoy more of, regardless of what sort of nutrients your diet may be lacking.