Clean, safe water doesn't happen by accident — it is the result of a carefully engineered chain of chemical treatment steps, each requiring repeatable, accurate dosing. From the moment raw water enters a municipal plant to the moment treated effluent is returned to the environment, every drop is conditioned by chemicals: coagulants, disinfectants, pH adjusters, corrosion inhibitors, and more.
For more than 40 years, LMI metering pumps and controllers have been the chemical-feed standard for municipal water and wastewater utilities worldwide. Recognized for accuracy, durability, and ease of integration, LMI pumps deliver the precision required to protect public health, optimize chemical consumption, and meet regulatory standards.
LMI pumps and controllers are deployed at every step of the conventional water treatment process — and at every dosing point of the wastewater treatment chain. Each step has its own chemistry, control logic, and pump-selection criteria.
Surface and groundwater sources require multi-step conditioning before they meet drinking water standards. LMI metering pumps dose coagulants, oxidants, pH adjusters, disinfectants, and corrosion inhibitors with the accuracy required to protect both public health and distribution-system infrastructure. • Coagulation & Flocculation — alum, ferric chloride, polymer dosing • Taste & Odor Control — chlorine, potassium permanganate, ozone, hydrogen peroxide • Disinfection — sodium hypochlorite, chloramines, chlorine di oxide • pH & Alkalinity Correction — caustic, soda ash, lime, acid • Corrosion Control — Zinc Orthophosphate (ZOP) dosing to prevent lead leaching
Wastewater enters the plant loaded with organic matter, nutrients, suspended solids, and pathogens. Chemical dosing supports every stage of treatment — from upstream odor control to final effluent disinfection — and ensures compliance with discharge permits. • Influent odor control — hydrogen sulfide (H₂S) suppression with calcium nitrate, ferric chloride, hydrogen peroxide • Phosphorus removal — ferric chloride or alum dosing for chemical P removal • Sludge conditioning — polymer dosing for thickening and dewatering • Effluent disinfection — sodium hypochlorite + sodium bisulfite for dechlorination before discharge
Engineered to meet today’s most demanding water treatment standards
The Bigger Picture: From Chemical Feed to Complete Treatment Strategy