Watsan matters

13.-1046. Open defecation free.

13.-1045. Open defecation field.

13.-1044. On-site electro-chlorination.

13.-1043. On-site wastewater treatment.

13.-1042. On-site storage and treatments.

13.-1041. On-site sanitation.

13.-1040. On-site sanitation systems.

13.-1039. Off-site sanitation.

13.-1038. Ocean.

13.-1037. Occyst.

13.-1036. Objective tree.

13.-1035. Nutrition.

13.-1034. Nutrient.

13.-1033. Nutrient-enriched filter material.

13.-1032. Nutrient solutions.

13.-1031. NPK rating.

13.-1030. Nudge.

13.-1029. NPK value ( of a fertiliser ).

13.-1028. NPK rating.

13.-1027. Non-return valve.

13.-1026. Non-renewable groundwater.

13.-1025. Non-point source ( NPS ) pollution.

13.-1024. Non-point pollution.

13.-1023. Non-planted filter.

13.-1022. Non-biodegradable wastewater.

13.-1021. Nitrogen.

13.-1020. Nitrogen-immobilisation.

13.-1019. Nitrified.

13.-1018. Nitrification.

13.-1017. Nitrification and distillation of urine.