We've had a few days where it's been above freezing.. My husband decided back in January to add 20 more chickens to our existing flock of 65 hens & 15 ducks. We quarantined the new birds and they seemed healthy and I didn't spot anything so we combined them about a month ago. Today we were doing chores and we found what's looks like small round worms in one of the waterers. We've got Wazine 17 and plan to worm first thing tomorrow. I've read that I need to retreat in 10-14 days with another wormer but I can't find anything for a large flock. Can someone please give me a recommendation? Is there another wormer that I'd be able to add to their water? I've never had to deal with worms so I definitely need some pointers. Thanks in advance.