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, turnip, kale and mustard greens are nutritional powerhouses with distinct flavors. Mix them or eat them separately to enjoy their powerful tastes. Collard greens contain 771 micrograms of vitamin A and 34.6 milligrams of vitamin C per 1-cup serving. These antioxidants help to lower the risk of oxidative stress on your cells, which is cell damage that can occur when your nutrient intake is low and when toxic chemicals and environmental pollutants enter your body.