Why is our bathroom water leave a blue stain?

The blue stains in your bathroom water are most likely caused by copper corrosion. Copper pipes are commonly used in plumbing systems, and over time, the copper can react with oxygen and water to form copper oxides, which can give the water a blue-green tint. This is especially noticeable when the water has been sitting in the pipes for a while, such as first thing in the morning.

There are a few factors that can contribute to copper corrosion, including:

* Water chemistry: The pH level of your water can affect how corrosive it is to copper pipes. Water with a low pH (acidic) is more corrosive than water with a high pH (alkaline).

* Temperature: Hot water is more corrosive to copper pipes than cold water.

* Oxygen levels: The more oxygen in the water, the more likely it is to react with copper and cause corrosion.

* Presence of other metals: The presence of other metals in the water, such as iron, can also accelerate copper corrosion.

If you are concerned about copper corrosion in your bathroom water, you can have the water tested to determine the copper levels. If the copper levels are high, you can take steps to reduce copper corrosion, such as installing a water filter or adjusting the pH level of the water.

Here are some additional tips to help reduce copper corrosion in your bathroom water:

* Flush the pipes: Regularly flushing the pipes by running the water for a few minutes can help to remove any copper oxides that have built up.

* Use a water filter: A water filter can help to remove copper and other contaminants from the water.

* Adjust the pH level: If the water in your home is acidic, you can adjust the pH level by adding a pH adjuster to the water.

* Replace copper pipes: If your copper pipes are old and corroded, you may want to consider replacing them with a more corrosion-resistant material, such as PVC or stainless steel.