By Sarah Chen · environmental engineer · water, waste and everything that flows downhill
“After losing my entire 5,000-litre tank to a sudden blue-green algae bloom, I learned that off-grid water storage demands daily vigilance, not just hope.”
— Sarah. Every litre accounted for.
ArticlesCalculatorsSite PlannerShopLook, if your water tank's green or smells like a swamp, you're doing it wrong. Fix it now. No excuses.
Look, if your water tank's green or smells like a swamp, you're doing it wrong. Fix it now. No excuses.
Drain the tank completely. Scrub every inch with a stiff brush and a 1:10 bleach solution (1 part bleach, 10 parts water). Rinse THOROUGHLY with clean water. One rinse won't cut it.
Pro tip: Use a Bunnings scrub brush ($5.95) and generic bleach ($2.50 for 500ml). Don't use "scented" bleach – it'll poison your water.
Add 2-4ml of household bleach per 100L of water. Stir. Wait 24 hours before drinking. That's it. No fancy gear needed. If it tastes like chlorine, flush the tank with clean water and re-chlorinate.
Don't overdo it. More bleach = more headaches. Stick to the numbers.
Supplier note: Bunnings sells 500ml bleach for $2.50. Woolworths has it for $2.20. Same stuff. Buy the generic.
Algae = gross. It grows in light. Solution: Keep your tank 100% covered. No gaps. Paint the tank black (if plastic) to block light. If it's a clear tank, wrap it in black tarp or paint it black.
Blunt truth: If your tank's green after 2 weeks, you didn't cover it properly. Or you're using a clear tank. Fix it. Don't wait for the mosquitoes to breed.
Water sanitation isn't optional. It's survival. Clean the tank every 6 months. Chlorinate after cleaning. Block the light. Done. No more "maybe" or "probably".
Get it right. Or get sick. Simple as that.
While many off-grid projects are achievable as DIY, certain situations require licensed professionals:
Always check local regulations and obtain necessary permits before commencing work.
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