... filter head, filter, into the water pipes, drains and flushing water mains, as well as access to water, such as the composition of backwashing ... out organic material, adsorption of residual chlorine in the water, using water more than less than or equal to chlorine 0 ... filter head, filter, into the water pipes, drains and flushing water mains, as well as access to water, such as the composition of ...