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Cleaning removes what the biocide cannot reach. Sludge in the basin and biofilm on wetted surfaces shelter Legionella from chemistry that is otherwise working, which is why a tower can have a healthy chlorine residual and still fail a test. Gotech drains, desludges, cleans and disinfects the system, confirms it with a water test, and gives you a dated report for your file.
Dirt blows into an open cooling tower continuously. It settles in the basin as sludge, and micro-organisms colonise the wetted surfaces as biofilm. Both are nutrient and both are shelter — biofilm in particular protects bacteria from biocide, and amoebae living within it act as hosts in which Legionella replicates.
This is why dosing alone does not solve a biological problem. If the biocide cannot physically reach the organism, the dose is irrelevant. The EMSD Code of Practice requires cleaning, desludging and disinfection as part of operation and maintenance for exactly this reason.
Routine cleaning removes sludge and disinfects; it does not dissolve hardness scale. If the fill is hard, pale and crusted, it needs acid cleaning: the descaler is recirculated through the tower for 4 to 6 hours, then neutralised and rinsed.
A clean without a diagnosis buys you a few months. If the tower fouled because the dosing failed, or because pH drifted, or because the drift eliminators are damaged, the count comes back — because the cause never left. We look for the reason, not just the symptom.
A tower that is not cleaned on schedule costs you in three directions at once: fouled surfaces waste energy continuously, sludge accelerates under-deposit corrosion beneath the deposit where you cannot see it (see metal corrosion in water systems), and the biological risk builds until a sample catches it. At 1,000 cfu/mL or above that becomes a statutory notice and emergency decontamination — which costs more than the cleaning you deferred, and lands on your desk with a deadline attached.
It depends on the tower's use, condition and environment. The EMSD Code of Practice requires cleaning, desludging and disinfection as part of routine operation and maintenance — commonly at least twice a year, plus whenever a test result or inspection calls for it (see how often should a cooling tower be cleaned?). We set the schedule from the tower's actual condition.
Yes — a proper clean means draining the basin, so the tower is offline for the work. We plan it around your operation. For a mall or hotel that usually means working outside peak hours.
Call us — this is time-critical, particularly if a notice has been served. See emergency response for what happens next, and do not drain or dose the system before taking advice: you can destroy the evidence you will need.
No, and the distinction matters. Disinfection kills organisms; cleaning physically removes the sludge and biofilm that shelter them. Disinfecting a dirty tower gives a poor result, because the chemistry never reaches what it is aimed at.
It depends on the tower's condition and the work it needs, so every job is quoted individually in writing after a free site visit and assessment. Tell us about the tower by phone or WhatsApp and we will reply within one working day with a written quotation — no obligation.
Scheduled or urgent — tell us the tower and we will quote it.