🔽 Underground Tanks • 🟤 Collect more sludge & dirt at the bottom. • 🌊 Cleaning focuses on deep sludge removal. • 🧹 Professionals use powerful suction & scrubbing to clear hidden waste. 🔼 Overhead Tanks • ☀️ Face heat exposure from the sun. • 🦠 Risk of algae & bacteria growth due to warmth. • 🧴 Cleaning involves disinfection & cooling-friendly methods.