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A 200-room beach resort can run five different water systems behind the wallpaper: potable from a brackish well or seawater intake, hot-water with Legionella control, swimming-pool circulation, on-sit … read more

Manganese is iron's harder-to-treat sibling. Same staining problems (purple-black instead of orange), same source aquifers, but oxidation requires higher pH or stronger oxidants and the chemistry is u … read more

Iron is the #1 well-water complaint in North America: rust stains on fixtures, metallic taste, brown laundry, and slime in toilet tanks. The secondary MCL is 0.3 mg/L (cosmetic, not health). Treatment … read more

Lead almost never enters water at the source — it leaches from service lines, lead solder joints, and brass fixtures downstream of the treatment plant. The EPA Lead and Copper Rule action level is 15 … read more

The EPA MCL for fluoride is 4.0 mg/L; the secondary MCL (cosmetic) is 2.0 mg/L. WHO guideline: 1.5 mg/L. Naturally occurring high-fluoride aquifers in East Africa, India, China, and parts of the weste … read more