5 Signs Your Septic Tank is Leaking Groundwater in Sri Lanka
Learn how to detect groundwater leaks during monsoon season and how sealed Parawewa bio tanks protect your drinking water.
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20 Essential Articles on Eco Bio Septic Systems
Technical guides, environmental compliance analyses, and cost calculators by Ranjith Dharmakeerthi Mannage, Managing Director.
Parawewa vs. Mechanical STPs: Option A Gravity vs Option B Seal Type
Compare 24/7 electric air blower running costs against Option A 100% passive gravity flow and Option B: Seal Type Parawewa System.
Installing Bio Septic Tanks in High Water Table Lands (Ja-Ela, Mathugama & Coastal)
Step-by-step engineering guide for installing leak-proof bio septic systems in coastal and marshy soils like Ja-Ela, Mathugama and Negombo.
How Does the Parawewa Bio Septic Tank Work Without Electricity?
Explore the 4-stage natural biological filtration process that uses beneficial microbes to digest sludge into clean water.
Why Gully Bowser Emptying is No Longer Necessary for Modern Homes
Say goodbye to dirty gully bowser suction trucks. See how Parawewa maintains continuous aerobic digestion to eliminate sludge.
How Parawewa Helps Properties Pass Central Environmental Authority (CEA) Standards
Learn about BOD and COD discharge compliance standards in Sri Lanka and why Parawewa's lab-tested discharge meets government environmental codes.
10-Year Cost Breakdown: Traditional Concrete Pit vs Parawewa Bio Tank
A 10-year cost comparison showing how Parawewa removes recurring gully bowser costs and power bills over the life of the system.
Best Bio Septic Tank Options for Hotels & Eco-Resorts in Sri Lanka
Eco-tourism resorts in Bentota, Ella, and Sigiriya rely on odorless waste management. See how Parawewa keeps sewage out of sight, smell and mind.
How Heavy Monsoons Affect Household Sewage Systems in Sri Lanka
Heavy flooding can cause traditional septic tanks to back up into bathrooms. Learn how non-return bio tanks keep your home hygienic during monsoon floods.
The Story of Sri Lanka Patent #16371: How Ranjith Dharmakeerthi Mannage Invented Parawewa
Read the inspiring history of how Sri Lankan inventor Ranjith Dharmakeerthi Mannage created Parawewa in 1996 and won the 2018 Presidential Innovation Award.
Septic Tank Installation Cost in Sri Lanka: What Affects the Price
What actually drives septic tank pricing in Sri Lanka, and how Option A and Option B installations compare on total cost, not just the quote.
Septic Tank vs Soakage Pit: What's the Difference and Which Do You Need?
Septic tanks and soakage pits solve different problems. Here's how each works, and why Sri Lankan properties usually need both, not either.
Bio Septic Systems for Apartment & Condominium Complexes in Colombo
High-occupancy apartment buildings need wastewater systems sized and engineered differently from single homes. Here's what developers should plan for.
Best Wastewater Systems for Schools, Hospitals & Institutional Buildings
Schools, clinics, and other institutional buildings have wastewater needs that differ from both homes and factories. Here's what to consider.
When to Install Your Septic Tank: A New House Construction Timeline Guide
Installing a septic tank at the wrong stage of construction causes avoidable rework. Here's where it fits in a typical Sri Lankan build timeline.
Septic Tank Maintenance Checklist: What Homeowners Should (and Shouldn't) Do
Parawewa is engineered to be maintenance-free, but a few simple homeowner habits protect the system's performance over its full warranty period.
Common Septic Tank Problems and Warning Signs Every Homeowner Should Know
From slow drains to unexpected odors, here's a practical troubleshooting guide to the most common septic tank warning signs in Sri Lankan homes.
What to Do During a Septic System Emergency or Backup
A septic backup is stressful but manageable. Here's a calm, practical step-by-step guide for what to do — and what to avoid — in the moment.
How Bio Septic Systems Protect Sri Lanka's Waterways, Wells and Ecosystems
Poorly treated household sewage is a quiet but significant contributor to well and waterway contamination in Sri Lanka. Here's the bigger environmental picture.
Septic Tank Regulations & Building Permit Requirements in Sri Lanka
New construction in Sri Lanka typically requires local authority and, in some cases, CEA approval for sewage disposal. Here's a general overview of what property owners should expect.