https://parawewa.lk/articles.html Guides on eco bio septic tanks, groundwater protection, gravity and seal type options, and Sri Lanka Patent #16371. en Tue, 06 Oct 2026 08:00:00 +0530 https://parawewa.lk/articles/septic-tank-installation-cost-sri-lanka/ https://parawewa.lk/articles/septic-tank-installation-cost-sri-lanka/ Tue, 29 Sep 2026 08:00:00 +0530 Pricing Guide What drives septic tank pricing in Sri Lanka, and how Option A and Option B installations compare on total cost, not just the quote. https://parawewa.lk/articles/septic-tank-vs-soakage-pit-sri-lanka/ https://parawewa.lk/articles/septic-tank-vs-soakage-pit-sri-lanka/ Tue, 29 Sep 2026 08:00:00 +0530 Buyer'S Guide Septic tanks and soakage pits solve different problems. Learn how each works and why Sri Lankan properties usually need both, not either. https://parawewa.lk/articles/bio-septic-systems-apartments-condominiums-colombo/ https://parawewa.lk/articles/bio-septic-systems-apartments-condominiums-colombo/ Tue, 29 Sep 2026 08:00:00 +0530 Apartments & Condos High-occupancy apartment buildings need wastewater systems sized differently from single homes. Here is what developers should plan for. https://parawewa.lk/articles/wastewater-systems-schools-hospitals-institutions/ https://parawewa.lk/articles/wastewater-systems-schools-hospitals-institutions/ Tue, 29 Sep 2026 08:00:00 +0530 Institutional Buildings Schools, clinics and other institutional buildings have wastewater needs that differ from homes and factories. Here is what to consider. https://parawewa.lk/articles/when-to-install-septic-tank-new-house-construction/ https://parawewa.lk/articles/when-to-install-septic-tank-new-house-construction/ Tue, 29 Sep 2026 08:00:00 +0530 New Construction Installing a septic tank at the wrong stage of construction causes rework. See where it fits in a typical Sri Lankan building timeline. https://parawewa.lk/articles/septic-tank-maintenance-checklist-homeowners/ https://parawewa.lk/articles/septic-tank-maintenance-checklist-homeowners/ Tue, 29 Sep 2026 08:00:00 +0530 Maintenance Parawewa is engineered to be maintenance-free, but a few simple habits protect performance over the warranty period. A homeowner's do and don't list. https://parawewa.lk/articles/common-septic-tank-problems-warning-signs/ https://parawewa.lk/articles/common-septic-tank-problems-warning-signs/ Tue, 29 Sep 2026 08:00:00 +0530 Troubleshooting From slow drains to unexpected odours, a practical troubleshooting guide to the most common septic tank warning signs in Sri Lankan homes. https://parawewa.lk/articles/septic-system-emergency-backup-what-to-do/ https://parawewa.lk/articles/septic-system-emergency-backup-what-to-do/ Tue, 29 Sep 2026 08:00:00 +0530 Emergency Guide A septic backup is stressful but manageable. A calm, step-by-step guide to what to do, and what to avoid, in the moment. https://parawewa.lk/articles/bio-septic-systems-protect-wells-waterways-sri-lanka/ https://parawewa.lk/articles/bio-septic-systems-protect-wells-waterways-sri-lanka/ Tue, 29 Sep 2026 08:00:00 +0530 Environmental Impact Poorly treated household sewage quietly contaminates wells and waterways in Sri Lanka. Here is the bigger environmental picture and what helps. https://parawewa.lk/articles/septic-tank-regulations-building-permits-sri-lanka/ https://parawewa.lk/articles/septic-tank-regulations-building-permits-sri-lanka/ Tue, 29 Sep 2026 08:00:00 +0530 Regulations & Permits New construction in Sri Lanka typically needs local authority approval, and sometimes CEA approval, for sewage disposal. A general overview. https://parawewa.lk/articles/septic-tank-leaking-groundwater-sri-lanka/ https://parawewa.lk/articles/septic-tank-leaking-groundwater-sri-lanka/ Tue, 15 Sep 2026 08:00:00 +0530 Water Safety Learn the 5 signs your septic tank is leaking groundwater in Sri Lanka's monsoon, and how a sealed Parawewa bio tank protects your drinking water. https://parawewa.lk/articles/parawewa-vs-mechanical-stp-option-a-option-b/ https://parawewa.lk/articles/parawewa-vs-mechanical-stp-option-a-option-b/ Tue, 15 Sep 2026 08:00:00 +0530 Cost Savings Compare 24/7 electric blower running costs of mechanical STPs with Parawewa Option A (gravity, no electricity) and Option B (Seal Type Parawewa System). https://parawewa.lk/articles/bio-septic-tank-high-water-table-sri-lanka/ https://parawewa.lk/articles/bio-septic-tank-high-water-table-sri-lanka/ Tue, 15 Sep 2026 08:00:00 +0530 High Water Table Lands Engineering guide to installing leak-proof bio septic systems in high water table, coastal and marshy soils like Ja-Ela, Mathugama and Negombo. https://parawewa.lk/articles/how-parawewa-bio-septic-tank-works/ https://parawewa.lk/articles/how-parawewa-bio-septic-tank-works/ Tue, 15 Sep 2026 08:00:00 +0530 Biological Science Explore the 4-stage natural biological filtration in a Parawewa bio septic tank, where beneficial microbes digest sludge into clean water. https://parawewa.lk/articles/gully-bowser-emptying-not-needed-bio-septic/ https://parawewa.lk/articles/gully-bowser-emptying-not-needed-bio-septic/ Tue, 15 Sep 2026 08:00:00 +0530 Maintenance Free See how continuous aerobic digestion in a Parawewa bio septic tank reduces sludge build-up, so repeated gully bowser suction visits are not needed. https://parawewa.lk/articles/cea-compliance-septic-tank-sri-lanka/ https://parawewa.lk/articles/cea-compliance-septic-tank-sri-lanka/ Tue, 15 Sep 2026 08:00:00 +0530 Cea Compliance Understand BOD and COD discharge standards in Sri Lanka and how a Parawewa bio septic system supports Central Environmental Authority (CEA) compliance. https://parawewa.lk/articles/concrete-septic-pit-vs-parawewa-10-year-cost/ https://parawewa.lk/articles/concrete-septic-pit-vs-parawewa-10-year-cost/ Tue, 15 Sep 2026 08:00:00 +0530 Financial Analysis A 10-year cost comparison of a traditional concrete septic pit and a Parawewa bio tank, covering gully bowser fees, power bills and repairs. https://parawewa.lk/articles/bio-septic-tank-hotels-eco-resorts-sri-lanka/ https://parawewa.lk/articles/bio-septic-tank-hotels-eco-resorts-sri-lanka/ Tue, 15 Sep 2026 08:00:00 +0530 Hotels & Resorts How odour-free bio septic systems suit hotels and eco-resorts in Bentota, Ella and Sigiriya, with no gully bowser visits near guest areas. https://parawewa.lk/articles/monsoon-flooding-household-sewage-sri-lanka/ https://parawewa.lk/articles/monsoon-flooding-household-sewage-sri-lanka/ Tue, 15 Sep 2026 08:00:00 +0530 Monsoons & Climate Heavy monsoon flooding can make traditional septic tanks back up into bathrooms. Learn how sealed bio tanks keep homes hygienic during floods. https://parawewa.lk/articles/sri-lanka-patent-16371-parawewa-story/ https://parawewa.lk/articles/sri-lanka-patent-16371-parawewa-story/ Tue, 15 Sep 2026 08:00:00 +0530 Patent & History How Ranjith Dharmakeerthi Mannage created the Parawewa bio septic system in 1996 and won the 2018 Presidential Innovation Award.