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.
Eating dark green leafy vegetables is vital to a healthy, balanced diet. Make a salad: Keep salads interesting by varying their colors, textures and varieties. Perk them up with small tender leafy greens such as romaine lettuce, spinach and arugula mixed with different kinds of tomatoes, cucumbers and carrots.