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Wazine, as with other wormers that are added to water has its disadvantages in that you dont know if a chicken even drank the treated water or drank enough of it to be effective. It would be like them not getting wormed at all. Also during cooler temps, chickens drink less water. When you administer the valbazen into the chickens mouth, you KNOW she got properly wormed and no guesswork.
Valbazen slowly kills worms over several days, so there isnt any toxic worm overload. The worms are either digested as protein in their digestive system or excreted.
Go ahead and use valbazen first, then 10 days later redose them again with valbazen.