13.-1136. Planning with the community.

Watsan matters
13.-1135. Plankton.
13.-1134. Pitcher irrigation.
13.-1133. Pit latrine.
13.-1132. Pit humus.
13.-1131. Pit composting toilet.
13.-1130. Piston.
13.-1129. Piston - Plunger suction pump.
13.-1128. Piezometric surface.
13.-1127. Piezometric level.
13.-1126. Piezometer.
13.-1125. Piedmont.
13.-1124. Phytoremediation.
13.-1123. Phytoplankon.
13.-1122. Phreatophytes.
13.-1121. Phreatic level.
13.-1120. Phreatic aquifer- Water table aquifer.
13.-1119. Photosynthesis.
13.-1118. Photolysis.
13.-1117. Photocatalysis.
13.-1116. Phosphorus.
13.-1115. Phenol red.
13.-1114. Pharmaceutical waste.
13.-1113. Pharmaceutical residues.
13.-1112. pH.
13.-1111. PET.
13.-1110. Pesticide.
13.-1109. Pest.
13.-1108. Personal protective equipment - ( PPE ).
13.-1107. Persistent organic pollutants - ( POPs ).