| Electricity required |
Zero power, runs on gravity flow |
| Backup generator and diesel required |
No generator, No diesel |
| 2-shift skilled STP operator |
No operator |
| 24x7 noise pollution |
Noise-free |
| Motors, blowers and frequent oil change required |
No motors and blowers; hence no oil change required |
| Risky if exhaust fans are switched off |
No exhaust fans. Hence no risk |
| Involves chemicals (Urea, Chlorine etc.) |
100% chemicals-free |
| Dedicated STP space and operator room required |
Operator room not required; saves on space. |
| Sludge pathogen risk |
No sludge pathogen risk |
| Sludge removal - daily/weekly. |
Sealed tank. No manual handing. Risk-free. |
| STP life just 3 - 5 years. Need to keep buying spares. |
Lifetime product |
| MLSS monitoring; need to add bacteria on an hourly basis |
Bacteria to be added only once in 3 months |
| Bad odour |
Completely odour-free |
| 30% minimum load needed to begin operations |
Even one toilet is enough to begin operations |
| Bar screen filter to be cleaned regularly |
No bar screen filter required |
| Can be accidentally switched off |
Cannot be switched off |
| 24x7 maintenance required |
Maintenance-free |
| Installation time 1 - 2 months |
Can be installed within 24hours |
