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.
Bring a large pot of salted water to a boil. Add the collard greens in batches and cook until just tender, about 10 minutes. Drain the greens in a colander and rinse under cold water to cool; squeeze to remove any excess water. Heat the oil in a large saucepan over medium heat. Add the garlic and cook, stirring, for 1 minute.