Many homeowners are interested in minimizing the intake of sodium in their diets. The question asked most often is whether the use of phosphates in drinking water systems for sequestering or corrosion inhibition will significantly add to the sodium content of their drinking water. This is a very logical question.

Most drinking waters naturally contain 0-60 mg/L of sodium. If you soften your water, you could be increasing that level to 150-400 mg/L. The addition of a phosphate product will add less than one mg/L to the water. Typical feedrates for polyphosphates as PO4 are 1-4 mg/L. Each mg/L of phosphate product contains approximately 0.15 mg/L sodium. Therefore, four mg/L of phosphate added to the water will only add 0.6 mg/L sodium. State laws limit the feed of phosphate to 10 mg/L as PO4. At the maximum feedrate only 1.5 ppm sodium would be added to the water.

We hope this information is of help. If you have further questions, please call us at 1-800-359-3570.