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.
Some of the commonly grown leafy greens are collards, kale, lettuce, spinach, turnip greens, and Swiss chard. However there are some popular specialty leafy greens such as mustard greens, arugula, cress, mache, dandelion, and Asian vegetables.Leafy greens are becoming more popular in home gardens..iscard any diseased, bruised or yellow leaves. Harvest collards by removing the outer leaves, spinach by cutting dark green outer tender leaves that are three to six inches long, and Swiss chard by removing outer leaves. Harvest by removing outer leaves of kale, mustard greens, and turnip greens, he said.