Water Storage Tanks

Types

• Plastic (LLDPE or rotational-moulded) tank — light, rust-free and common for terraces, schools and homes; available in single and multi-layer builds.
• Triple-layer tank — an opaque outer layer and a white inner layer limit light and algae growth in stored water.
• FRP tank — fibre-reinforced plastic, used for larger or special-use storage such as chemicals.
• Stainless steel or mild steel tank — sturdy and used where temperature, hygiene or fire-water storage needs are stricter.
• Underground sump or RCC tank — built on site for large buildings and housing societies, often with a terrace tank above.

What to check before buying

• Capacity in litres sized to daily use; many planners store one to two days of demand.
• BIS certification for plastic tanks, and food-grade, virgin material for drinking water.
• Wall thickness, number of layers, and UV stabilisation if the tank stays in the sun.
• Lid, manhole, outlet and overflow fittings, and whether they are included.
• Terrace load: a full tank is heavy, so confirm structural capacity and a level base.
• Warranty period, delivery and installation terms, and a GST invoice.

Who buys them

Offices, schools, hospitals, shops, factories, housing societies, contractors, NGOs and government offices.

Frequently asked questions

What tank capacity is right for a building?

A common planning figure is around 135 litres per person per day for residential use, with lower figures for offices. Multiply by occupants and the days of storage you want.

Why choose a multi-layer tank?

The dark outer layer blocks sunlight, which slows algae growth and keeps water cooler. Common brands include Sintex, Supreme, Kisan and Jindal.

Can one tank serve drinking and flushing water?

Keep them separate where possible, and use a food-grade tank for drinking water.