0
We're unable to sign you in at this time. Please try again in a few minutes.
Retry
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
Retry
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
ARTICLE |

Softened Water

Morton Lewis, PhD
JAMA. 1974;228(8):978. doi:10.1001/jama.1974.03230330020010.
Text Size: A A A
Published online

ABSTRACT

To the Editor.—  The letter by McGarvey (227:1258, 1974) concerning the sodium content of water-softened water is both incorrect and misleading. The sodium chloride used to regenerate the ion-exchange resins of home water-softeners does just that; it exchanges sodium ions for the calcium and magnesium ions removed from the water. These calcium and magnesium ions are then removed in the backwash cycle of the regeneration process as the chloride salt. Thus, all the chloride ions are removed. As fresh water then goes through the regenerated resin bed, the hardness elements, calcium and magnesium, replace the sodium on the resin, and the sodium goes into the drinking water as the salt of the anion to which the calcium and magnesium ions were formerly bound. This is usually a sulfate, carbonate, or bicarbonate. The only chloride ions in the water are the chloride ions that were in the water before it was softened.

Topics

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Figures

Tables

References

Letters

CME
Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.

Multimedia

Some tools below are only available to our subscribers or users with an online account.

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Related Content

Customize your page view by dragging & repositioning the boxes below.

Jobs
brightcove.createExperiences();