Depending on the type of building, its users and behaviour of people as inhabitants, visitors the volume of water used by a person can be derived and is termed as Population Equivalent (PE), 1 PE= 150lts/ day. Based on this a general guidline is developed for designers to plan for a wastewater treatment plant. 1 PE = hostel/ guest house rooms 1 bed (guest) camping 2 persons Fine dine restaurants 1 seat 3 meals café with no cooking 10 seats club house (no cooking) 5 persons sports ground 30 persons industrial unit 2 workers office 3 employees The above are guidelines, while consulting an expert is always the best option. Please give us the information of your project and we will help with right treatment design calculation.