Home › Guides

Commercial Water Treatment Guides

Technical guides on commercial and industrial water treatment written from operational experience — not marketing copy. Each guide covers the mechanics of a technology or process, what affects performance, and how to evaluate systems for your application.

Wastewater and compliance

• pH Meters for Commercial Water Use: EPA Methods and the 15-Minute Rule — EPA 150.1 and 150.2, the 15-minute grab sample hold time, why composites are prohibited and pH cannot be averaged, the 40 CFR 401.17 trap that causes pretreatment violations, grab vs. continuous monitoring, electrode selection for dirty streams, and the calibration records an inspector asks for.
• Industrial water waste treatment — Pretreatment requirements, common wastewater streams, discharge regulations, and when to bring in a licensed professional.

System operation and maintenance

• Water Softener Troubleshooting: A Commercial Diagnostic Guide — Symptom-first diagnosis for hard water returning, no regeneration, continuous drain flow, brine tank full of water, salt bridges, injector clogs, leaks and noise. Includes the brine-draw verification test, resin sample interpretation, compensated hardness sizing math, filter placement order, and a commercial PM schedule.
• How long do commercial water softeners last? — Resin life, control valve longevity, and when to repair vs replace.
• How often should a commercial water softener regenerate? — Demand-initiated vs. time-clock regeneration, and how to calculate the right frequency for your hardness load.

Reverse osmosis

• RO Water for Brewing — Why reverse osmosis is the right starting point for craft brewery water control. Covers chloramine removal, ion-by-ion brewing chemistry, residual alkalinity, mash pH, mineral additions by style, malt contributions, blend vs. full-RO strategy, and system sizing for 3–50 BBL breweries.
• Commercial RO Pre-Treatment Guide — What goes before the RO membrane and why. Correct sequence for municipal and well water. Iron limits, hardness thresholds, SDI requirements, chloramine removal, and equipment recommendations for 200–16,000 GPD systems.
• Iron in Well Water: How to Test, Identify, and Remove It — Ferrous vs. ferric vs. iron bacteria, EPA limits, FerroVer testing, treatment options by iron type, why water softeners fail at high iron, and complete treatment trains for well water systems.
• Hard Water: What It Is, How to Test It, and How to Treat It — Hardness scale in GPG and PPM, USGS classification, how to read test strips and use titration kits, effects on commercial equipment including tankless water heaters and RO membranes, and treatment options.
• Water Hardness Calculator — Convert between GPG, PPM, mg/L, mmol/L, and German/French degrees instantly. Calculate water softener hardness settings with iron compensation, and convert Hach 5-B titration drop counts to GPG.
• Atmospheric Water Harvesting Explained — How AWG technology actually works: condensation vs. sorption methods, MOF desiccants, performance data by climate, and where the technology fits in commercial and industrial water supply today.
• Brackish Water Reverse Osmosis — What brackish water is, how BWRO systems work, real CAPEX and OPEX data from seven operating US facilities, the four scaling types and how to control them, concentrate disposal options, and commercial system selection for high-TDS applications.
• Agricultural Reverse Osmosis Guide — RO system selection, sizing, and operation for irrigation, greenhouse, and livestock water applications.
• Raptor RO Case Study — Operational case study of the US Water Systems Raptor commercial RO in a real food service installation.

Filtration technologies

• How GAC filtration works — Granular activated carbon media, contact time, service life, and applications.
• Commercial reverse osmosis and ultrafiltration — How membranes work, when to use RO vs UF, and what affects performance.

Frac tank applications

• Frac Tank Flow Equalization — Using frac tanks for flow equalization in industrial wastewater and municipal applications. Sizing, baffling, and operational considerations.
• Frac Tank Environmental Applications — Emergency response, spill containment, and remediation applications for frac tanks. Liner selection, decontamination, and regulatory considerations.

Industry guides

• pH Testing in Commercial Water — pH vs alkalinity explained, EPA standards by sector, meter selection, electrometric vs colorimetric methods, and QC requirements for permit compliance.
• How to Calibrate a pH Meter — Step-by-step protocol based on EPA Method 9040C and Standard Methods 4500-H. Buffer selection, slope requirements, how often to calibrate, and compliance documentation.
• Chloramine in Water: What Removes It and What Doesn't — Does boiling remove chloramine? No. Complete guide covering chloramine vs. chlorine, catalytic carbon EBCT tables, UV photolysis, chemical reduction, RO membrane protection, and commercial sector recommendations for brewing, dialysis, pharmaceutical, and food processing.
• Brewery Water Treatment — Water chemistry for brewing: mineral additions, RO and blending, alkalinity reduction, and process water quality for cleaning and cooling.
• Brewing Water Chemistry — Mineral profiles by beer style. Calcium, sulfate, chloride, and bicarbonate targets for every major style; sulfate-to-chloride ratio; residual alkalinity and mash pH; salt addition reference; step-by-step adjustment process.
• Hydroponics EC, TDS & pH Guide — EC and TDS targets by crop and growth stage, why the 500 vs. 700 conversion scale matters, pH drift and correction, nutrient lockout ranges, meter selection and calibration, and RO water for controlled-environment agriculture.
• Water treatment for restaurants and food service
• Water treatment for hotels and hospitality
• Industrial process water treatment
• Water treatment for healthcare facilities

Industry standards reference

• NSF Water Filter Certifications Explained — What NSF/ANSI Standards 42, 53, 58, 61, 372, and 401 actually test, what each covers and doesn’t cover, and which certifications matter for commercial RO, carbon filters, softeners, and point-of-use drinking water systems.
• Budget Water Filters vs. Professional Systems — What NSF certifications actually reveal. Why the NSF 42 label misleads buyers, how to verify certification claims in the NSF database, media bed depth and contact time, why push-fit fittings fail, and a 10-year cost comparison.

Contaminants of emerging concern

• Pharmaceuticals in Drinking Water: What the Data Actually Shows — Why EPA has no MCL for any pharmaceutical compound, what the draft CCL 6 group listing actually means, the misquoted 80% statistic vs. the real USGS well sampling data, which compounds survive conventional treatment, RO and GAC rejection by compound class, and why no field colorimeter can measure these compounds.

Water chemistry fundamentals

• Well Water Test Kits: What to Actually Test For — The four parameters every private well needs annually, why pH, hydrogen sulfide and bacteria can't be mailed to a lab, realistic costs by test, correct sampling protocol, EPA action levels with what each exceedance means, and lender/VA loan transaction testing.
• Why Your Water Smells Like Sulfur: The Hot/Cold Test That Finds It — Hot-water-only odor is the water heater anode rod, not a treatment problem. Covers the sulfate-reducing bacteria mechanism, why sulfide can't be mailed to a lab, Gastec detector tube method, SRB/IRB BART population tables, concentration thresholds, and treatment by ppm.
• What is deionized water? — How ion exchange removes dissolved minerals, the difference between DI and distilled water, ASTM purity types, where it’s used in labs, healthcare, manufacturing, and brewing, whether it’s safe to drink, and materials compatibility.
• Nitrate Removal Water Filter Guide — What causes nitrates in well water, what removes them (and what doesn't), EPA limits, and the Crystal Quest commercial ion exchange system at 15–390 GPM.
• NSF Water Filter Certifications — NSF/ANSI standards 42, 53, 58, 61, 372, and 401 explained in plain language. What each covers, what it doesn’t, which certifications matter by application, and how to verify claims in the NSF database.

Instrument reference

• Measuring TDS in Water: What Your Meter Actually Measures — No TDS meter measures TDS; it measures conductivity and applies a conversion factor ranging from 0.50 to 0.82. Includes the NDSU conversion table, fixed-factor error analysis, meter specifications that actually matter, calibration including the NaCl field method, a 10-step field protocol, and interpretation tables for drinking water, industrial, and livestock use.
• Colorimeter vs. Spectrophotometer — When to use each instrument, measurement principles, and selection guide for field and laboratory water analysis.

About the editor

Guides on this site are written by Lawrence Quarles, Alabama Grade IV Wastewater Operator with 18 years of industrial and municipal water and wastewater treatment experience. Full background →