Biofilm

Biofilm is a thin, slimy layer of bacteria and other microorganisms that grows on wet surfaces — the inside of a water tank, the walls of pipes, the overflow of a rarely-cleaned cistern. It forms wherever water sits still, and in Dubai's heat a domestic water tank is an ideal place for it to develop if the tank isn't cleaned on a schedule. That matters because biofilm isn't just a taste or smell problem: it can harbour bacteria and degrade water quality, and it builds up alongside the sediment and dust that settle out of stored water. It's the main reason a tank should be drained, scrubbed and disinfected every six to twelve months rather than left until the water looks or smells off — cleaning physically removes the biofilm and sediment that a simple flush won't shift. Tank cleaning and disinfection is a routine job for a plumber in Dubai, and keeping it on a schedule is far cheaper than dealing with contaminated water later.