@Helicopter Mom I saw your other post regarding ascarids. Ascarids can mean any type of roundworm (nematode) that a chicken can get. Generally, large roundworms (galli) are the most common.
Wazine specifically treats large roundworms and no other type of roundworm in poultry. Wazine acts as a large roundworm flush. As I mentioned, it's impossible to tell if your chickens drank enough of the wazine/water mixture to be effective, especially since you live in cold Wisconsin.
Safeguard or Valbazen will take care of large roundworms and many other types of nematodes in chickens. It would be best to go ahead and worm them now with one or the other products as Wyorp Rock mentioned. It's best to worm them in the early morning before they eat.
Each day after you worm your birds, provide them boiled plain white rice mixed with buttermilk in their feed to eat. Buttermilk is a better probiotic than yogurt and is easily absorbed. Yogurt tends to pass through them. This mixture should also clear up the diarrhea you're seeing.
Keep in mind that there's a good chance of reinfection especially if your birds are on the same soil all the time due to worm eggs contaminating the soil. Wet or damp soil doesnt help neither. A monthly worming schedule would be best as well as adding sand in the pen will help keep it dry.