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.
As a general rule, you should aim to eat at least five servings of vegetables daily (thatâs about 2 1/2 cups of cooked vegetables), and that includes leafy greens. As long as theyâre prepared in a healthy way, leafy greens, like other nonstarchy vegetables, are a great addition to your diet and offer countless health benefits. Leafy greens are full of vitamins, minerals, and disease-fighting phytochemicals.