Oh well it will have done them good to have a bit longer course, if they’ve not had an effective wormer before. If you do get powder, there are several posts on here about how to mix and use it, or do ask when the time comes. They are supposed to eat only treated pellets for 7 days, abd then each hen is supposed to dose herself with the right amount for her individual needs in weight and appetite, and this diet is normal for commercial hens who never get a more varied diet anyway, poor things. But of course our lucky girls get a much more varied diet than that, and don’t appreciate being shut in with a whole week of just boring pellets. Instead, you can mix up a smaller amount of ‘treat food’ including corn, sunflower seeds etc, add the right amount of powder, and feed measured amounts of the mix each day and just watch it going down, with them eating normally otherwise.