Iron - If your water tastes metallic or leaves behind a distinct reddish stain, iron is present in your water. Manganese leaves dark marks on water-using appliances and can stain sinks and drains. Cloudy, dirty water is caused by sediments. These come from sand, dirt or other inorganic matter getting into wells, or by run-off of matter into the water supply. Low PH (Acidic Water) If you’re noticing bluish-green stains on your fixtures, your water has a low pH level. Anything measuring less than 7 pH is considered acidic. Microbiological include any type of organic materials such as algae, mold and Bacteria. These causes your water to taste and smell earthy or woody, and Bacteria Causes different types of Deceases Reverse Osmosis water filtration systems that incorporate carbon block filters are an effective way to remove up to 98% of chlorine in water. Carbon block prefilters will not only remove chlorine in water, but also protect delicate RO membranes that can be damaged by contact with chlorine.