I have been working on trying the praziquantel - the first thing I noticed was the viscosity of this stuff - it is like syrup -they say that it contains oxybispropanol as a solubulizing agent and this must be what it making it so thick - it was impossible to even draw up into a fine needled syringe - then when I was finally able to get it into the test water, it formed an oil slick on the surface - I tried to mix it around well. but am not sure if any of the med is even in the water - after one hour and 45 minutes at containers of 1, 2 and 3x recommeneded dosage, the worms seem unaffected - this may be because the med is not soluble in water (not sure if this the case - I'll have to look into that) and is not reaching the AEFW in sufficient concentrations due to this - if it is not readily soluble in water, we may have to try much higher doses to reach appreciable water concentrations