Safe Water
The Complete Guide to Drinking Water Purification, Testing, Filtration, RO, UV, Disinfection and Emergency Water Safety
Author: SB Luwang
Clear water is not necessarily safe water.
A glass of drinking water may look perfectly clean while containing bacteria, excessive fluoride, arsenic, nitrate, lead, or other contaminants that cannot be detected by sight, taste, or smell.
At the same time, many households spend money on unnecessary purification systems simply because they have been told that every home needs RO.
Safe Water provides a more scientific and practical approach.
Instead of recommending one purifier for everyone, this book teaches readers how to:
Identify the source → Test the water → Understand the hazard → Select the right treatment → Maintain the system → Verify the result.
What You’ll Learn
Understand Your Drinking Water
Learn how drinking water becomes contaminated through groundwater, rivers, borewells, storage tanks, pipelines, agricultural runoff, floods, sanitation systems, and household handling.
Read a Water-Test Report
Understand important parameters including:
- pH
- TDS
- Electrical conductivity
- Turbidity
- Hardness
- Iron
- Manganese
- Fluoride
- Nitrate
- Arsenic
- Lead
- Microbiological indicators
You’ll also learn why a low TDS reading does not automatically mean water is safe.
Choose the Right Purification Technology
Detailed explanations cover:
- Sediment filtration
- Sand and multimedia filtration
- Ceramic filtration
- Microfiltration
- Ultrafiltration
- Nanofiltration
- Activated carbon
- Ion exchange
- Water softening
- Iron and manganese removal
- Arsenic treatment
- Fluoride removal
- Reverse osmosis
- UV disinfection
- Chlorination
- Ozone
- Advanced oxidation
- Distillation
- Boiling
- Solar water treatment
Do You Actually Need RO?
One of the book’s most important sections explains when reverse osmosis is genuinely useful—and when simpler treatment may be better.
Learn how to select treatment for:
- High-TDS borewell water
- Hard groundwater
- Iron-rich water
- Fluoride contamination
- Arsenic contamination
- Nitrate
- Microbial contamination
- Chlorinated municipal water
- Rainwater
- Surface water
Household Water Purifier Buying Guide
Learn how to evaluate claims such as:
- RO + UV + UF
- 7-stage / 10-stage purification
- TDS controllers
- Mineral cartridges
- Alkaline water
- Copper water
- “99.99% germ removal”
- NSF/ANSI certification claims
The book explains how to distinguish genuine technical performance from marketing language.
Borewell and Groundwater Treatment
Practical guidance includes:
- Borewell sanitary inspection
- Seasonal testing
- Iron treatment
- Hardness control
- Fluoride removal
- Arsenic treatment
- RO pretreatment
- Storage-tank hygiene
Community and Institutional Water Systems
Dedicated chapters cover water treatment for:
- Villages
- Schools
- Hostels
- Hospitals
- Hotels
- Restaurants
- Small commercial RO plants
- Community water-treatment schemes
Emergency Water Purification
Learn what to do during:
- Floods
- Well contamination
- Water-supply failures
- Natural disasters
- Microbial contamination
The book explains:
- When to boil water
- When chemical disinfection is appropriate
- How emergency filters work
- Safe emergency water storage
- When not to use a contaminated source
Emerging Water Contaminants
The book also introduces modern water-quality concerns including:
- PFAS
- Microplastics
- Pharmaceuticals
- Endocrine-active compounds
- Cyanotoxins
- Pesticides
- Persistent industrial chemicals
Real-World Case Studies
Practical examples include:
- Municipal water with chlorine taste
- Borewell water with high iron
- Hard groundwater
- High-TDS borewell
- Fluoride-contaminated groundwater
- Arsenic-contaminated groundwater
- Unsafe spring water
- Rainwater harvesting
- Flood-contaminated wells
- Village treatment plants
- School drinking-water systems
- Restaurant and hotel water systems
Practical Worksheets and Checklists
The book includes ready-to-use tools such as:
- Water Sample Record
- Water-Test Interpretation Worksheet
- Borewell Inspection Checklist
- RO Maintenance Log
- UV Maintenance Log
- Filter Replacement Record
- Storage Tank Cleaning Log
- Community Plant Daily Operating Sheet
- Emergency Water Checklist
- Annual Testing Calendar
- Household Purifier Buying Checklist
- Treatment Selection Matrix
- Quick Formula Sheet
Who Should Read This Book?
Ideal for:
- Homeowners
- Borewell users
- Students
- Water-treatment technicians
- Plumbers
- Facility managers
- School and hostel administrators
- Hospital engineering teams
- Hotel and restaurant operators
- NGOs
- Rural water-supply workers
- Community organisations
- Environmental-health students
- Anyone interested in safe drinking water
The Central Principle
No purifier is universally correct.
The correct treatment depends on the source water and the contaminants actually present.
Test first. Treat second. Verify always.
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