Pool Water Testing with LaMotte Down Under

Send us Fan MailMagnesium, Salt & the Truth About Water Testing with LaMotte – Part 1Is your salt test really measuring salt?What happens when magnesium enters the equation?And why do two different salt tests sometimes give two completely different answers?This week on Mondays Down Under, Lee and Nick welcome Hieron from LaMotte for a fascinating deep dive into modern water testing, magnesium pools, calcium hardness, Langelier Saturation Index (LSI), and why understanding your test results is just as important as performing the test itself. Whether you're servicing pools every day or managing a retail water testing lab, this episode explains why blindly trusting numbers without understanding the chemistry behind them can cost your customers money—and shorten the life of their equipment.In This Episode Why total hardness is no longer the same as calcium hardness How magnesium changes water chemistry  Why magnesium hardness must be separated from calcium hardness  The relationship between hardness and the Langelier Saturation Index (LSI) Why pH remains the single biggest factor affecting water balance  Does magnesium actually affect scaling?  Understanding the difference between conductivity salt meters and reagent-based salt testing Why two salt tests can produce dramatically different readings  The hidden problem of "dead" salt and elevated TDS  When water replacement becomes the only practical solution  Protecting expensive salt chlorinator cells through accurate testing  Why experienced technicians ask questions instead of simply printing reports  The psychology of educating customers and building long-term trust  A preview of LaMotte's upcoming professional training course for the pool industry Key TakeawaysOne of the biggest myths discussed is that all salt readings are equal.Traditional conductivity meters measure the electrical conductivity of dissolved solids, while LaMotte's Spin system chemically measures usable chloride ions—the portion of salt that can actually produce chlorine. Understanding that distinction can dramatically improve troubleshooting and help explain why older pools often experience chlorination issues despite appearing to have sufficient salt. The conversation also explores why magnesium pools require technicians to think differently about hardness testing. Magnesium contributes to total hardness but should not simply be substituted for calcium when calculating water balance or the LSI. Accurate testing allows professionals to properly determine true calcium hardness instead of relying on outdated rules of thumb. Beyond chemistry, the discussion focuses on customer communication. The best technicians don't simply hand customers a printout—they ask better questions, interpret the results, educate pool owners, and build relationships that last for years. Featured GuestHieron – LaMotte Water chemistry specialist  Professional water testing educator  Expert in Spin water analysis technology  Developer of LaMotte's upcoming online professional training program Coming Next WeekPart Two continues the conversation with even more practical discussions on professional water analysis, advanced chemistry, and improving customer outcomes through better testing and education. Listen, subscribe, and join the conversation wherever you get your podcasts. Support the showThank you so much for listening! You can find us on social media:FacebookInstagramTik TokEmail us: [email protected]