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Langelier Saturation Index

Hard water — is the type of water that has high mineral content (in contrast with soft water ). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and… … Wikipedia
Hot tub — dablink|This article is about the pool. For the Seinfeld epidsode see The Hot Tub for the Drawn Together episode see Hot Tub (Drawn Together episode)A hot tub is a large home made or manufactured tub or small pool full of heated water and used… … Wikipedia
Reverse osmosis — Schematics of a reverse osmosis system (desalination) using a pressure exchanger. 1: Sea water inflow, 2: Fresh water … Wikipedia
LSI — may mean* Learning Style Inventory (LSI), an assessment developed by David A. Kolb to measure an individual s learning style preference * Lake Superior and Ishpeming Railroad (AAR reporting mark), a U.S. railroad offering service from Marquette,… … Wikipedia
Lead and copper rule — The Lead and Copper Rule , or LCR, is a United States federal regulation which limits the concentration of lead and copper allowed in public drinking water at the consumer s tap, as well limiting the permissible amount of pipe corrosion occurring … Wikipedia