Why Cleaning Your Water Tank is More Important Than You Think
I’ll be honest — for years I assumed my rainwater tanks were “self-cleaning.” After all, it’s just rainwater, right? Fresh, clean, straight from the sky. That’s what I thought too… until I discovered the water inside was far from what I imagined. It was murky, smelly, and not something I wanted anywhere near my garden, never mind my family.
That’s when I came across Water Tank Wizard, and their story immediately resonated with me. They actually started in 2023 after experiencing the exact same wake-up call: believing rainwater tanks were clean, only to discover contaminated, foul-smelling water when they finally checked inside.
And here’s the truth: most of us have no idea what’s really happening inside our water tanks.
What’s Really in Your Tank?
It’s not just water in there. Over time, tanks collect all sorts of nasty surprises:
Sediment build-up from borehole water
Dust, leaves, and even animal droppings
Mosquito larvae and bacteria
Sometimes even dead animals (yes, it happens!)
And let’s not forget viruses and other harmful contaminants
The result? That precious water you’re storing could be unsafe for your plants, your animals, or your family. Plus, dirty water clogs up irrigation and sprinkler systems — meaning your garden and lawns suffer too.
We had the Water Tank Wizard team, based in Durbanville, come out to clean our tanks — and they truly do an excellent job. They service the entire Cape Town Metropole, offering both once-off deep cleans and regular maintenance. What sets them apart is that they don’t just skim the surface; their method involves removing the water, getting right inside the tank, and scrubbing it thoroughly clean. And if you have multiple tanks, they can even transfer the water between them to avoid any wastage.
They also offer extra services like leaf traps and other small accessories that make a big difference in keeping your system running smoothly.
The Science Behind Dirty Tanks
Here’s why dirty tanks are a real problem from a scientific point of view:
Bacteria Growth: Stagnant water provides the perfect breeding ground for harmful bacteria like E. coli and Salmonella. Once they form colonies, they multiply rapidly.
Biofilm Formation: Inside a dirty tank, a slimy film builds up on the walls and floor. This biofilm traps contaminants and protects bacteria, making them harder to kill and more resistant to treatment.
Mosquito Breeding: Even small amounts of stagnant water can produce hundreds of mosquito larvae, which carry diseases.
Chemical Contaminants: Dust and droppings introduce nitrates, phosphates, and even heavy metals. Over time, these can leach into your stored water and harm plants and soil health.
pH and Smell Changes: Decomposing organic matter (leaves, dead insects, animal droppings) causes acidity changes in the water, giving it that musty, foul smell.
Clogging & Corrosion: Sediment settles at the bottom of tanks. This not only clogs pumps, filters, and sprinklers but can also corrode the inside of your tank over time.
Studies have shown that rainwater stored in unclean tanks often fails basic drinking-water standards, with coliform bacteria detected in up to 60–80% of tested samples. Even if you don’t drink the water, using it in irrigation spreads contaminants into your soil and onto edible crops.
Costs & Peace of Mind
Water Wizzard Tanks pricing depends on your number of tanks, their size, how accessible they are, and what condition they’re in. But the best part? They offer free quotations, so you’ll know exactly what to expect.
At the end of the day, water is one of our most precious resources. If we’re taking the time to harvest it, store it, and rely on it, then we should also make sure it’s clean and safe.
Water Tank Wizard put it perfectly on their website:
“We stand as the premier champions of water tank cleanliness and maintenance, extending our unwavering commitment to homes, public institutions, and farmers alike.”
After learning what really hides inside water tanks, I couldn’t agree more.
If you’re in Cape Town and haven’t cleaned your tank yet, I’d say now’s the time. You’ll thank yourself later — and your garden, your family, and even your irrigation system will too.
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