WATSAN Envirotech

Category: WaterTech & CleanTech 

Startup Summary 

WATSAN is a sustainable water purification and sanitation startup focused on providing affordable, electricity-free solutions for clean drinking water. Designed for low-maintenance use with zero water wastage, WATSAN aims to improve public health and water accessibility, especially in rural and resource-limited communities.

First Byline: Pure water, zero waste, no electricity needed. 

Second Byline: Sustainable clean water for every home. 

Highlights 

• Electricity-free water purification system

• Nano-filtration using siliceous (natural) materials

• Zero water wastage

• Low maintenance (no candle replacement needed)

• Retains essential minerals like Calcium, Iron, and Magnesium

• Eco-friendly with reduced carbon emissions

• High output: ~15 liters in 2 hours

Team 

• CHANDRASEKARAN. J: FOUNDER, DIRECTOR & CEO 

• P.N.SUBRAMANIAN: CO- FOUNDER 

• RAJALAKSHMI: CHIEF CHANGE MAKEROUTREACH 

What They Do 

• Design and manufacture natural clay-based microfilters

• Use nano-filtration technology for effective purification

• Deliver clean, mineral-rich drinking water from raw source water

• Promote green, sustainable purification systems

• Enable clean water access for rural and low-resource communities

Pain Points 

• Need for electricity in most water purifiers → not suitable for rural/low-resource areas

• High energy consumption (up to ~25 kWh/month) in conventional filters

• Carbon emissions from electric purification systems

• Dependence on boiling water using firewood → causes deforestation and pollution

• Water wastage in traditional purification methods (especially RO systems)

• Use of harmful chemicals (like PFAS) in RO plants contaminates surface water

• Disposal of used membranes → adds to landfill waste and environmental damage

• Removal of essential minerals (Ca, Fe, Mg) in many existing filters

• Inefficient filtration that may not fully remove pathogens, turbidity, and heavy metals

• Lack of eco-friendly and sustainable purification alternatives

Solution 

• Provides safe drinking water without electricity

• Eliminates pathogens, turbidity, and heavy metals

• Reduces dependence on boiling water (saves energy & firewood)

• Avoids harmful chemicals (like PFAS) used in conventional RO systems

• Minimizes environmental impact (no membrane waste, landfill pollution)

• Supports sustainable and affordable access to clean water