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.
In the nutrition world, dark leafy greens play the role of the ultimate superfood, offering up crucial vitamins and minerals as well as a host of health benefits. Choose raw or cooked baby spinach, collard greens, kale, or Swiss chard and youâll be stocking your body with magnesium for very few calories.