Cooling Tower Maintenance Scheduler

Legionella-control guidance (ASHRAE 188, CTI, and UK HSG274) expects cooling towers cleaned and disinfected at least twice a year, with monthly water-treatment verification and quarterly mechanical checks. Severe duty, harsh environments or regulatory requirements shorten it — and your OEM manual, insurer or local code always takes precedence over the generic default.

Monthly (often weekly for dosing): biocide levels, conductivity/cycles of concentration, corrosion/scale inhibitor residuals, visual check of basin and drift eliminators — plus quarterly Legionella sampling where your risk plan requires it. Semi-annual: drain, physically clean basin/fill/sump, disinfect per your water-treatment provider's procedure, and inspect fill and eliminators for damage. The monthly round is what keeps the semi-annual clean from becoming a remediation.

Treat the due date as the end of a window, not a cliff: industry practice allows roughly ±10% of the interval for planning convenience. What kills cooling towers is systematic slippage — each service a few weeks late quietly stretches the real interval far beyond the standard one. The overdue badge exists to make that visible.

For a handful to a few dozen cooling towers, honestly, yes — most small operations need exactly this: what's due, what's overdue, one tap to reset after service. You outgrow it when you need work-order history, parts inventory, multiple users and audit trails; until then, a register the crew actually uses beats a CMMS nobody opens.