13.-0100. Arsenic removal filter.

13.- WASH Glossary.
13.-0099. Arsenate.
13.-0098. Arid.
13.-0097. Arid region.
13.-0096. Arbovirus.
13.-0095. Arborloo.
13.-0094. Aquitard.
13.-0093. Aquifer..
13.-0092. Aquifer pollution vulnerability.
13.-0091. Aquifer ( unconfined ).
13.-0090. Aquifer ( confined ).
13.-0089. Aquiclude.
13.-0088. Aqueduct.
13.-0087. Aquatic.
13.-0086. Aquaponic.
13.-0085. Aquaculture.
13.-0084. Aqua privy.
13.-0083. Apron.
13.-0082. Appropriation doctrine.
13.-0081. Application of urine.
13.-0080. Application of stored urine.
13.-0079. Application of sludge.
13.-0078. Application of pit humus and compost.
13.-0077. Application of dried faeces.
13.-0076. Application of dehydrated faeces.
13.-0075. Antiseptic.
13.-0074. Anoxic.
13.-0073. Anammox bacteria.
13.-0072. Anal cleansing water.
13.-0071. Anaerobic.