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.
A 2009 study from the Archives of Internal Medicine found as many as 3 out of 4 Americans suffer from a Vitamin D deficiency. We all know about the bone-building benefits of milk, but many other foods can help boost your intake of Vitamin D and the calcium you need to keep your bones strong and joints supple. One cup of Collard Greens provides 256mg of calcium. 2  Yogurt-High in protein and healthy bacteria for your gut, yogurt offers 400mg of calcium in just an 8-ounce serving. 3  Choose non-fat yogurt for a satisfying and healthy snack.