Engineering guides to water treatment, wastewater, equipment operation and regulations.
How manganese differs from iron, why aeration and a standard filter are not enough, and which units make up a manganese removal scheme.
September 2026 · 7 min→Wastewater · Residential · EngineeringSeptic tank retrofit: turning an existing tank into biological treatmentWhen a concrete or plastic septic tank can be kept and fitted with an aerated zone with circulation instead of being replaced, and where this approach reaches its limit.
September 2026 · 7 min→Wastewater · Residential · EngineeringHow a deep biological treatment plant works: zones inside the tankWhat happens to wastewater between the inlet and the outlet, why a zone without oxygen is needed, and why ammonium is removed by bacteria, not by a filter.
July 2026 · 7 min→Operation · Residential · WastewaterSeptic tank installation and start-up: pit, anchoring, first winterWhy an empty tank floats out of the ground, where the inlet pipe blocks up, and what to do in the first weeks after you switch it on.
July 2026 · 7 min→Sizing · Residential · WastewaterSeptic tank for 3, 4 or 6 people: sizing by occupants and peak flowWhy the plant is sized by people and litres rather than by floor area, and which of the two numbers usually turns out to be the limiting one.
July 2026 · 7 min→Wastewater · Residential · SizingWhere treated water goes: gravity, pumped discharge, soil polishingLevels and soil decide the receiving point, not the size of the plant — and it has to be settled before you buy, not after the tank is in the ground.
July 2026 · 7 min→