Water Treatment, Pharma & Chemical Buying Guides
Practical articles from Suraj Chemicals for plant operators, purchase teams and EHS managers: how to dose, choose, store and buy industrial chemicals, with a focus on water treatment and pharma.
New articles
Zero Liquid Discharge (ZLD) Explained for Indian Plants
What zero liquid discharge means, which Indian industries it applies to, the typical ZLD treatment train (pre-treatment, RO, evaporator) and the chemicals each stage uses.
AquacultureShrimp Pond Water Quality: Liming, Disinfection and Key Parameters
A practical guide for shrimp farmers in Andhra Pradesh, Tamil Nadu and Kerala: pond preparation, liming, chlorine disinfection and the water-quality ranges to watch.
Water TreatmentSTP Chemicals for Apartments and Commercial Buildings: What You Need
A practical guide to sewage treatment plant (STP) chemicals for apartments, hotels, hospitals and tech parks: coagulants, polyelectrolyte, disinfectants, pH and odour control.
Water TreatmentRO Antiscalants: Why Your Membranes Need One and How to Choose
How antiscalants protect reverse osmosis (RO) membranes from calcium carbonate, sulphate and silica scaling, where to dose them and what to ask your supplier.
Water TreatmentPAC Grades Explained: Liquid vs Powder, Basicity and Aluminium Content
What the numbers on a Poly Aluminium Chloride (PAC) specification mean: liquid vs powder, Al2O3 content, basicity, IS 15573 and how to compare quotes fairly.
Pharma & Food GradesIP, BP and USP Grades Explained for Pharma Buyers
What IP, BP and USP mean on a chemical grade, how pharmacopoeia grades differ from technical and food grades, and what documents pharma buyers should ask for.
Water TreatmentHow to Run a Jar Test to Find the Right Coagulant Dose
Step-by-step jar test for ETP, STP and water treatment plants: how to compare PAC, alum and ferric chloride, pick the polymer and find the lowest effective dose.
Pharma EffluentFenton Oxidation for High-COD Pharma Effluent: The Basics
How Fenton oxidation with hydrogen peroxide and ferrous sulphate treats high-COD pharmaceutical and API effluent: pH, chemicals, steps, sludge and safety.
Water TreatmentETP Clarifier Not Settling? 8 Common Causes and Fixes
Troubleshooting poor settling in an ETP or STP clarifier: pH, coagulant and polymer dose, polymer preparation, hydraulic overload, sludge blanket and septic sludge.
Water TreatmentChoosing a Polymer for Sludge Dewatering
How to pick a cationic or anionic polyelectrolyte for filter press, screw press, belt press or centrifuge sludge dewatering, and how to prepare and dose it.
Water TreatmentChlorine Dosing for Drinking Water: Residual, Contact Time and Chemicals
How to chlorinate drinking water correctly: chlorine demand, free residual chlorine (IS 10500), contact time and choosing between bleaching powder, hypochlorite and chlorine.
Water TreatmentActivated Carbon in Water Treatment: Granular vs Powdered
How activated carbon removes colour, odour, chlorine and organics from water and effluent, the difference between granular (GAC) and powdered (PAC) carbon, and how to choose.
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Water Treatment
Zero Liquid Discharge (ZLD) Explained for Indian Plants
What zero liquid discharge means, which Indian industries it applies to, the typical ZLD treatment train (pre-treatment, RO, evaporator) and the chemicals each stage uses.
AquacultureShrimp Pond Water Quality: Liming, Disinfection and Key Parameters
A practical guide for shrimp farmers in Andhra Pradesh, Tamil Nadu and Kerala: pond preparation, liming, chlorine disinfection and the water-quality ranges to watch.
Water TreatmentSTP Chemicals for Apartments and Commercial Buildings: What You Need
A practical guide to sewage treatment plant (STP) chemicals for apartments, hotels, hospitals and tech parks: coagulants, polyelectrolyte, disinfectants, pH and odour control.
Water TreatmentRO Antiscalants: Why Your Membranes Need One and How to Choose
How antiscalants protect reverse osmosis (RO) membranes from calcium carbonate, sulphate and silica scaling, where to dose them and what to ask your supplier.
Water TreatmentPAC Grades Explained: Liquid vs Powder, Basicity and Aluminium Content
What the numbers on a Poly Aluminium Chloride (PAC) specification mean: liquid vs powder, Al2O3 content, basicity, IS 15573 and how to compare quotes fairly.
Water TreatmentHow to Run a Jar Test to Find the Right Coagulant Dose
Step-by-step jar test for ETP, STP and water treatment plants: how to compare PAC, alum and ferric chloride, pick the polymer and find the lowest effective dose.
Pharma EffluentFenton Oxidation for High-COD Pharma Effluent: The Basics
How Fenton oxidation with hydrogen peroxide and ferrous sulphate treats high-COD pharmaceutical and API effluent: pH, chemicals, steps, sludge and safety.
Water TreatmentETP Clarifier Not Settling? 8 Common Causes and Fixes
Troubleshooting poor settling in an ETP or STP clarifier: pH, coagulant and polymer dose, polymer preparation, hydraulic overload, sludge blanket and septic sludge.
Water TreatmentChoosing a Polymer for Sludge Dewatering
How to pick a cationic or anionic polyelectrolyte for filter press, screw press, belt press or centrifuge sludge dewatering, and how to prepare and dose it.
Water TreatmentChlorine Dosing for Drinking Water: Residual, Contact Time and Chemicals
How to chlorinate drinking water correctly: chlorine demand, free residual chlorine (IS 10500), contact time and choosing between bleaching powder, hypochlorite and chlorine.
Water TreatmentActivated Carbon in Water Treatment: Granular vs Powdered
How activated carbon removes colour, odour, chlorine and organics from water and effluent, the difference between granular (GAC) and powdered (PAC) carbon, and how to choose.
Water TreatmentWhat "Non-Ferric" Means in Alum — and Why It Matters for Treated Water
What the "non-ferric" designation on aluminium sulphate (alum) means, why iron contamination matters in water treatment, and what to check when buying alum.
Water TreatmentWater Hardness Explained: Causes and How It's Treated
What causes water hardness, why it matters for industrial processes, and which chemicals are commonly used to treat or manage it.
Water TreatmentHow to Choose a Coagulant for Effluent Treatment: Alum vs PAC vs Ferric Chloride
A practical comparison of aluminium sulphate (alum), poly aluminium chloride (PAC) and ferric chloride for effluent and water treatment coagulation — dosing, pH range, sludge and when to use each.
Water TreatmentChemicals for Effluent Treatment Plants (ETP): An Overview
An overview of the chemical treatment stages in a typical industrial effluent treatment plant — coagulation, pH correction, disinfection and sludge management.
Disinfection & ChlorinationBleaching Powder vs Sodium Hypochlorite: Choosing the Right Chlorination Chemical
Stable bleaching powder, high-strength calcium hypochlorite and liquid sodium hypochlorite compared — available chlorine %, shelf life, dosing and storage for water treatment and pool disinfection.
Water TreatmentAnionic vs Cationic vs Nonionic Polyelectrolytes: How to Choose
How to choose between anionic, cationic and nonionic polyelectrolyte flocculants for water and wastewater treatment, based on particle charge and application.
Buying Guides
TDS vs MSDS vs COA: What Each Document Tells a Chemical Buyer
The difference between a Technical Data Sheet (TDS), Safety Data Sheet (MSDS/SDS) and Certificate of Analysis (COA) for industrial chemicals, and which one you actually need.
Buyer's GuideSodium Metabisulphite: Food Grade vs Industrial (Non-Food) Grade
Food-grade sodium metabisulphite (SMBS, E223) vs industrial/technical grade compared — where each is used and why the grade distinction matters.
AlkalisSoda Ash Light vs Dense: What's the Difference and Which Do You Need
Light soda ash vs dense soda ash (sodium carbonate) compared — bulk density, dissolution rate, dust and typical applications for each.
Buyer's GuideSilica Gel Blue vs White Indicating — Which Desiccant to Choose
Blue (cobalt-indicating) silica gel vs plain white silica gel compared — how the colour-change indicator works, regulatory considerations, and which to buy.
SurfactantsSLES vs SLS: Choosing the Right Sulphate Surfactant for Your Formulation
Sodium Lauryl Ether Sulphate (SLES) vs Sodium Lauryl Sulphate (SLS) compared — mildness, foam character, solubility and where each is typically used.
Logistics & PackagingPackaging Options for Industrial Chemicals: Bags, Drums, IBCs & Bulk Tankers
How industrial chemicals are packed for supply — 25/50 kg bags, HDPE drums and carboys, 1000 L IBC totes, and bulk tanker — and how to decide which one fits your consumption volume.
Buyer's GuideIsopropyl Alcohol (IPA) Purity Explained: What 99.8% Actually Means
What IPA purity percentage means for cleaning, electronics and pharma use, how it differs from diluted rubbing-alcohol products, and what to check before ordering.
Buyer's GuideHow to Read a Certificate of Analysis (Test Report) for Industrial Chemicals
What Characteristics, Specifications and Results mean on an industrial chemical Certificate of Analysis (COA) or test report, and what to check before you place an order.
Solvents & PlasticizersDOP vs DBP vs DEP: Choosing the Right Phthalate Plasticizer
Dioctyl phthalate (DOP), dibutyl phthalate (DBP) and diethyl phthalate (DEP) compared — plasticizing efficiency, volatility and typical uses in PVC and other formulations.
Buyer's GuideCitric Acid: Anhydrous vs Monohydrate — Which Grade Do You Need?
Citric acid anhydrous vs monohydrate compared — moisture content, shelf life, dry-blend vs liquid use, and how to choose the right form for your process.
Desiccants & AdsorbentsChoosing a Desiccant: Silica Gel vs Activated Alumina vs Zeolite
Silica gel, activated alumina and zeolite molecular sieve compared as industrial desiccants — adsorption capacity, regeneration and typical applications.
AlkalisCaustic Soda Grades Explained: Flakes, Lye and Caustic Potash — Which to Buy
Sodium hydroxide (caustic soda) flakes vs liquid lye vs caustic potash (KOH) — uses, storage, handling and how to choose the right grade for your process.
Buyer's GuideCalcium Chloride Grades: Industrial 94% vs Food-Grade — What's the Difference
Industrial-grade calcium chloride (94% granules) vs food-grade calcium chloride compared — purity, permitted uses and why the grade matters.
Industry Guides
pH Correction and Disinfection Chemicals for Swimming Pools
An overview of the chemicals commonly used for swimming pool disinfection and pH balance, and how to think about choosing between chlorine sources.
Industry GuideWater Treatment Chemicals for Cooling Towers
An overview of the chemical treatment programs used in industrial cooling towers — scale control, biological growth, corrosion inhibition and blowdown chemistry.
Industry GuideFood-Grade Chemicals: Common Uses in Food Processing
An overview of common food-grade industrial chemicals — citric acid, calcium chloride, SMBS and more — and the roles they play in food and beverage processing.
Industry GuideChemicals Used in Textile Dyeing and Processing: An Overview
An overview of the industrial chemicals commonly used across textile pre-treatment, dyeing and finishing — from caustic soda to optical brighteners.
Industry GuideChemicals Used in Soap and Detergent Manufacturing
An overview of the raw materials commonly used in soap and detergent manufacturing — surfactants, builders, alkalis and functional additives.
Industry GuideChemicals Used in Paints and Coatings Manufacturing
An overview of the industrial chemicals commonly used in paint and coatings formulation — solvents, extenders, additives and pigments.
Industry GuideChemicals Used in Leather Tanning: An Overview
An overview of the industrial chemicals commonly used across leather tanning process stages — soaking, liming, tanning and finishing.
Industry GuideChemicals Used in Electroplating: A Practical Primer
An overview of the industrial chemicals commonly used in electroplating pre-treatment, plating baths and effluent treatment.
Industry GuideBoiler Water Treatment Chemicals Explained
An overview of the chemistry behind boiler water treatment — oxygen scavenging, scale prevention and pH/alkalinity control — and the chemicals commonly used.
Safety & Handling
Understanding GHS Hazard Pictograms on Chemical Labels
A quick-reference guide to the GHS hazard pictograms found on industrial chemical labels and SDS documents, and what each one actually means for handling.
Safety & HandlingUnderstanding Flash Points and Flammable Solvent Storage
What a solvent's flash point means in practice, and how to store flammable industrial solvents like acetone, toluene and IPA safely.
Safety & HandlingStoring Hygroscopic Chemicals: Keeping Powders and Flakes From Caking
Why hygroscopic industrial chemicals like caustic soda flakes and calcium chloride absorb moisture, and practical storage steps to prevent caking and waste.
Safety & HandlingSpill Response Basics for Common Industrial Chemicals
A practical first-response checklist for acid, alkali and solvent spills in an industrial setting — containment, neutralization and when to evacuate.
Safety & HandlingSafe Storage of Oxidizing Chemicals: Bleaching Powder, Hypochlorite and Hydrogen Peroxide
Storage guidance for oxidizing chemicals like calcium hypochlorite, sodium hypochlorite and hydrogen peroxide — segregation, temperature control and fire risk.
Safety & HandlingSafe Storage and Handling of Corrosive Industrial Chemicals: A Practical Checklist
A practical checklist for storing and handling corrosive industrial chemicals safely — segregation, container compatibility, PPE, spill containment and labeling.
Safety & HandlingSafe Handling of Strong Mineral Acids: Hydrochloric, Nitric and Phosphoric
Practical safe-handling guidance for hydrochloric, nitric and phosphoric acid — PPE, ventilation, dilution direction, and what to have on hand before you start.
Safety & HandlingChemical Compatibility: What Not to Store Together
A practical guide to chemical storage segregation — which industrial chemical classes should never share a storage area, and why.
Safety & HandlingA Practical PPE Guide for Industrial Chemical Handling
What personal protective equipment to use for handling common industrial chemical categories — acids, alkalis, oxidizers and solvents — and why.
Regulatory & Compliance
Understanding the 16 Sections of a Safety Data Sheet (SDS)
A section-by-section guide to what's in a standard GHS Safety Data Sheet (SDS/MSDS), and which sections matter most for storage, transport and emergency response.
Regulatory & ComplianceUnderstanding Shelf Life and Retest Dates on Industrial Chemicals
What a shelf life or retest date on an industrial chemical actually means, why some products need retesting rather than automatic disposal, and how to manage stock.
Regulatory & ComplianceUnderstanding HSN Codes and GST for Industrial Chemicals: A Practical Guide
How HSN classification and GST generally apply to industrial chemical purchases in India, and why confirming the exact code and rate with official sources matters.
Regulatory & CompliancePollution Control Board Consent Basics for Effluent Treatment Chemical Users
A plain-English overview of Pollution Control Board consent requirements relevant to industries using effluent treatment chemicals in Tamil Nadu and beyond.
Regulatory & ComplianceImport Documentation Checklist: What to Ask an Overseas Chemical Supplier For
A practical checklist of documents to request from an overseas industrial chemical supplier before import — quality, safety and customs paperwork.
Regulatory & ComplianceHazardous Chemical Rules in India: A Plain-English Overview for Buyers
An overview of India's Manufacture, Storage and Import of Hazardous Chemicals Rules and what they generally mean for industrial chemical buyers and storage sites.
Regulatory & ComplianceFSSAI Compliance for Food-Grade Chemical Buyers: What to Check
What FSSAI licensing generally means for buyers of food-grade industrial chemicals in India, and what documentation to request from your supplier.
Regulatory & ComplianceBIS Certification & Indian Standards for Industrial Chemicals: What Buyers Should Know
What BIS (Bureau of Indian Standards) certification and IS standards generally mean for industrial chemical buyers, and when to ask a supplier for it.
Technical Reference
What Is pH and How Do Industrial Chemicals Affect It?
A practical explanation of the pH scale for industrial buyers, and which common chemicals raise or lower pH — useful for water treatment and process control.
Technical ReferenceUnderstanding Moisture Content and Loss on Drying Specs in Industrial Powders
What moisture content or loss-on-drying specs mean on an industrial chemical spec sheet, why they matter for hygroscopic powders, and how to interpret the numbers.
Technical ReferenceUnderstanding CAS Numbers: What They Are and Why They Matter
What a CAS Registry Number is, why it's more reliable than a product name for identifying a chemical, and how to use it when comparing suppliers.
Technical ReferenceUnderstanding Assay / Purity Percentage on a Spec Sheet
What the assay or purity percentage on an industrial chemical spec sheet actually measures, and how it affects dosing and cost comparisons between suppliers.
Technical ReferenceTechnical Grade vs Laboratory (AR) Grade vs Food Grade: What the Labels Mean
The practical difference between technical grade, analytical reagent (AR) grade and food grade chemicals, and how to choose the right one for your use.
Technical ReferenceReading a Chemical Formula and Molecular Weight: A Quick Primer
A quick, practical explanation of chemical formulas and molecular weight for buyers who need to read a spec sheet without a chemistry background.