Calcium carbonate precipitation inhibition was discovered and patented in 1936. The phenomenal aspect of this discovery was the exceptionally low concentration of inhibitor (1 to 2 ppm) required. The process was named "threshold treatment" because only 2 ppm of sodium hexametaphosphate prevented precipitation of as much as 220 ppm of calcium carbonate hardness.
© 1973 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1973
Association for Materials Protection and Performance (AMPP)
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