<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31444277</termId><termName>water stability indicators</termName><termType>PT</termType><termNote><![CDATA[ Devices for monitoring the equilibrium of water, and that can supply an index useful in controlling anti-corrosion treatment. This is in respect to its degree of CaCO3 saturation. If a water has a negative Langelier Saturation Index (LSI) value, it is under-saturated with respect to calcium carbonate and is potentially corrosive. ]]></termNote><termCreatedDate>2026-03-30 20:59:39</termCreatedDate><relation><relationType>UF</relationType><termId>31483310</termId><termName>indicator, water stability</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31444278</termId><termName>water stability indicator</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31444202</termId><termName>chemical testing devices</termName><termType>PT</termType></relation></term>  </Zthes>