One indication of corrosive water is a high concentration of:

A high concentration of carbon dioxide in water is indeed an indication of corrosive water. In the context of water chemistry, increased levels of carbon dioxide can lead to a lowering of pH, making the water more acidic. This acidic condition can enhance the solubility of metals and other components in the water, leading to corrosion of pipes and other infrastructure.

Corrosive water can result from a variety of factors, such as the presence of organic material or certain environmental conditions that increase carbon dioxide concentrations. When carbon dioxide is high, it reacts with water to form carbonic acid, which can dissolve minerals and metals from pipes and other surfaces over time.

Algae odors, carbonates, and total dissolved solids do not have the same direct relationship with corrosivity. While high concentrations of total dissolved solids can indicate various water quality issues, they do not solely determine corrosivity. Similarly, while the presence of carbonates in water may have implications for hardness and scaling, they do not necessarily correlate with corrosive properties as carbon dioxide does.