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Text and illustrations © 2007 WateReuse Foundation

All rights reserved. No part of this document may be reproduced, either digitally or by mechanical means, without written permission from the publisher. Requests for permission to make copies of any part of the work should be addressed to WateReuse Foundation, 1199 North Fairfax Street, Suite 410, Alexandria, VA 22314 (,, telephone 703-548-0880, fax 703-548-5085).

The copyrights for photographs reproduced in this work are owned by the individuals who created those images. The photos are used here by nonexclusive license and may not be copied or reprinted without first obtaining permission in writing from the photographers.

The two-dimensional map of salinity by Hanson and Bendixen reprinted herein is used by permission of the University of California’s Division of Agriculture and Natural Resources. The graph of SAR versus EC herein, based on an earlier illustration by Ayers and Westcot, is used with permission from the United Nations Food and Agriculture Organization.

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