For Thirst Quenching, a Soft Touch Isn't Needed

Dear Dr. Fox:

In your response to the reader who asked about using softened water for her dogs, I think you may have misunderstood the question.

A water softener removes calcium and potassium from water by ionic exchange. This is done by passing the water through a medium (resin) charged with sodium from a brine solution. The water passing through gives up calcium and potassium and takes on sodium ions. There is also a carbon pre-filter on the system to remove chlorine and other contaminants that can damage the resin. One benefit of this process is to reduce mineral scale buildup on plumbing fixtures, sinks, etc.

Water softening has nothing to do with whether the water source is municipal or otherwise (it can be used for either) or whether the water contains compounds that might be unhealthy for pets. It does, however, improve or reduce those risks, other than whatever value is added by the carbon filter.

I use a filter for my drinking water (and I don't have any pets to worry about). Just wanted to clarify this point.

E.W.

Silver Spring

I thank you for the added information regarding my concerns over giving water that has been processed through a water softener to animals.