Water-water... don't have an environment which is causing hazardous contamination and microbial. -Check the lomhak environment to examine the risks to water quality monitoring and analysis.
. Water - water used must be from sources which pose no environmental contamination, hazardous substances and microbes - inspection environment if you are in the risk monitoring and analysis of water quality.
. Water - water used must be from the source which produces no environment contamination harmless objects and microorganism - inspect environment if in the risk monitoring and analysis of water quality