Made of Ultra thick super cold rolled steel plates 2mm thick B. Provides more corrosion resistance and anti-rust properly resulting in longer life compared to standard inner tank designs. C. A die-hard life span for inner tank and more than 25% strength than S.S. tank, ensured by multiple on line testing including 1. Uric Acid Test 2. Anti Alkaline Test 3. Fatigue Test 4. Environment Synchronization Test