Engineering Tool Accurate WHO / BIS 10500 Water Chlorination & Tank Capacity Calculator
Engineered Water Disinfection

Water Treatment Dosage & Tank Volume Calculator

Eliminate guesswork in chlorine dosing. Calculate exact tablet requirements for potable drinking water, residential overhead tanks, flood disaster kits, swimming pools, and clinical surface mopping.

1,000 Liters
10 L (Bucket) 1,000 L (Tank) 10,000 L 50,000 L
LITERS
Global Reference Guidelines

Target Free Available Chlorine (FAC) Benchmarks

Conforming to WHO Guidelines for Drinking-Water Quality and Bureau of Indian Standards (BIS 10500:2012).

Application Target FAC PPM Standard Benchmark Authority Recommended Adhish Formulation
Potable Drinking Water (Point of Use) 0.5 – 2.0 ppm WHO Drinking Water Guidelines / BIS 10500 CHLORITSAFE NaDCC 75mg / Halazone 4mg
Overhead Residential Storage Tanks 1.0 ppm CPHEEO Water Supply Manual CHLORITSAFE NaDCC 1.67g (for 1,000 Liters)
Monsoon Flood & Turbid Disaster Water 4.0 – 5.0 ppm UNICEF / Red Cross Emergency WASH CHLORITSAFE NaDCC 1.67g / 3.5g High Load
Swimming Pools & Water Parks 2.0 – 3.0 ppm US EPA / FINA Aquatic Standards Adhish Stabilized Chlorine / NaDCC 3.5g
Hospital Surface Mopping & Ward Hygiene 100 – 200 ppm CDC / WHO Environmental Surface Guidelines CHLORITSAFE NaDCC 1.67g (1 tab per 10 Liters)
Blood Spillage & Biohazard Decontamination 5,000 – 10,000 ppm NABH / CDC Universal Biohazard Protocols CHLORITSAFE NaDCC 1.67g (5-10 tabs per Litre)

Frequently Asked Chlorination Questions

How long should I wait before drinking treated water?

Allow a 30-minute contact time after dropping the effervescent tablet into water. This ensures 99.999% destruction of bacteria, viruses, and amoebic cysts before human consumption.

Why does NaDCC leave no chalky residue unlike bleaching powder?

Bleaching powder is calcium hypochlorite and contains up to 70% insoluble calcium carbonate and lime, which forms a thick white sludge that chokes pipes. NaDCC is 100% water-soluble and leaves zero sludge or sediment.

How can I test residual chlorine in my tank?

Use an Orthotolidine (OT) test kit or DPD-1 test strips. A yellow color in the OT test or pale pink in DPD-1 confirms safe residual disinfection between 0.5 and 2.0 ppm.