In a recent APD I said >>>>The medicine is [ Ivomectin ]. The stock strength should be 1:20. then using a diabetics type syringe available from chemists carefully measure out 0.5 (1/2) mg per 140 litres of tank water <<<<< this should read 0.05 mls per 140 litres. not 0.5 mg cheers Neil From the" Land Down Under" icq 13931687