Traditional concrete pits fill up with raw sludge because they lack active biological digestion, forcing owners to pay for a gully bowser call every few months. Parawewa bio septic tanks maintain a continuous aerobic bacterial cycle that breaks down solid waste on an ongoing basis, eliminating routine gully bowser emptying for the vast majority of residential and light-commercial installations.
Hiring a gully bowser suction truck is expensive, disruptive to a household or neighborhood, and — in dense urban areas — not always easy to schedule promptly. Parawewa, manufactured by Parawewa, was invented specifically to remove this recurring hassle through engineered biological decomposition rather than periodic mechanical pump-outs.
How the Cycle Stays Balanced Long-Term
In a conventional pit, solids accumulate faster than they decompose, so the tank's usable volume shrinks year after year until it must be emptied. Parawewa's design keeps bacteria continuously active and exposed to oxygen, so the rate of organic breakdown is designed to track the rate of input for a correctly sized tank — meaning sludge volume stabilizes instead of climbing indefinitely.
JSW Apparels (Pvt) Ltd, a garment manufacturing facility on Rajasamaranayake Mawatha in Panadura, is the kind of high-occupancy factory site where daily wastewater volume is significant — exactly where a maintenance-free, continuously self-digesting system removes the biggest operational headache of traditional pit sanitation.
What "Maintenance-Free" Actually Covers
- No scheduled gully bowser suction visits under normal residential usage
- No mechanical parts (blowers, compressors) to service in the Option A configuration
- No chemical dosing or additives required to keep the bacterial culture active
- Occasional visual inspection is still recommended, particularly after unusually heavy monsoon flooding
For most single-family homes, this means the tank installed at the time of construction can realistically remain in service, un-emptied, for the life of the property — a very different maintenance profile from the annual or twice-yearly gully bowser bookings that come with a traditional pit.
