Why Does Green Algae (Kaayi) Grow Inside Roof Tanks?
Green algae (commonly called Kaayi in Hindi) requires three elements to multiply rapidly: warm stagnant water, minerals, and sunlight. When sunlight penetrates semi-transparent or degrading overhead tanks, microscopic algae spores photosynthesize, turning crystal-clear drinking water greenish and foul-smelling within days.
Health Risks of Algae & Dirty Water
Using algae-contaminated water causes severe skin allergies, hair fall, eye irritation, and stomach infections when used for domestic washing, cooking, or tooth-brushing.
How to Prevent Algae Permanently: 3 Essential Steps
- Complete Light Blockade: Algae cannot survive in total darkness. Wrapping the tank in an opaque, reflective 5-layer cover eliminates 100% of internal light transmission.
- Keep Water Temperature Under 35°C: High heat accelerates bacterial colonies. A thermal jacket keeps water at room temperature.
- Secure Top Lid: A top umbrella cap prevents airborne dust, dead insects, bird droppings, and rainwater from seeping into the tank mouth.
Why Rooftop Tank Covers are Better than Frequent Chemical Cleaning
Hiring tank cleaning laborers every 2 months costs ₹800 to ₹1,500 per visit and uses harsh chlorine or bleaching chemicals that corrode pipes and leave chemical residues in your water line. Installing a durable UV thermal cover is a one-time 5-year investment that stops algae at the root cause without using harmful chemicals.