Ecology - discusses the sources of pollution

Laws and IRR related to Water Refilling Stations - discusses existing provisions of laws and regulations related to water supply.

Philippine National Standards for Drinking Water - discusses the different drinking water standards

Hydrology - discusses the water cycle and water sources

Water Chemistry - discusses the different physico-chemical properties of water and their health effects

Microbiology - discusses the different water-related diseases caused by microorganisms in water

Parasitology - discusses the different water-related diseases caused by parasites in water

Water Treatment Technology - discusses the different water treatment technologies

Plumbing - discusses the plumbing layout for refilling stations

Setting up a Water Refilling Station - discusses the setting-up of a WRS

Operation and Maintenance of a Water Refilling Station - discusses the maintenance of the water refilling system

Environmental Health Engineering - discusses the general principles of environmental health in relation to water supply provision

Water Safety Plan - discusses the identification of the critical control points in water purification systems and enumerates prevention control measures for the identified critical control points