Question: query regarding disinfectant use for disinfection of shed / wall / surrounding of shed ,pen 
Answer:  told him to use the disinfectant like   quick lime & potash  for the external surrounding of the farm premises , for internal disinfection of  pen  ,shed etc --  q-for all , b 904 can be use @ 1 gm / 5 lits of water besides this copper sulphate can also be use as disinfectant @ 1 gm / lits of water  for both the internal & external purpose