We priced jobs for a year off a costing for a plant that was never poured, so no line in it had ever been checked against an invoice. Re-costing the same plant at rates we had actually paid came out materially cheaper, and three scopes of work were missing from the model entirely.
A treatment plant does not destroy anything — it concentrates it. Field notes on where the screenings, grit, grease and sludge actually go, why we never quote hauling as a firm price, and the bin, hatch and hardstanding we now put on the drawing.
A softener is sized twice — once for exchange capacity and once for service flow rate — and the second number is the one most quotations leave out. Field notes on why a three-bathroom Cebu house often needs the larger vessel for flow rather than capacity, why undersizing fails quietly, and why we publish the arithmetic.
Most sites here have never measured their wastewater flow. If they buy district water, the bill already has. How we turn a monthly consumption figure into a design flow, the three steps of arithmetic, and where the method stops working.
How we quote a water treatment job in Cebu: process flow first, then the pump's flow rate, then the client's actual problems, then the filter and where it sits, and only then a price. Why the quotation carries three options instead of eight, and why we lead with the premium unit.
Two tenants above the plant room complained about a smell in the corridor, and everybody assumed the sewage treatment plant had failed. The tanks were fine. The air had found a route nobody had drawn.
Alkalinity falls weeks before pH moves. Field notes on recovering buffer from the anoxic return before buying a chemical, the three chemicals we have actually used, and why how you introduce it matters more than which one you pick.
The standard objection to a water softener is that soft water strips scale off metal pipe and leaves it corroding. In a Cebu building the risers are PPR, so the mechanism has nothing to act on — and the real saturation-index exposure is concrete, not pipe.
On one meat plant we kept the media moving in the first aeration tank and hung rope bundles in the second. Field notes on where we use MBBR, where we use FBBR-style fixed-film media, and the one result we cannot explain.
Sizing a dosing pump for four grease traps and 400 mL a day: why the smallest industrial pump is twenty-two times too big, why metering by time fixes that, why we threw out the solenoid-valve architecture, and why the tubing chose the pump.
