If your feed store doesnt carry Valbazen, here's where you can order it:
https://www.jefferspet.com/products/valbazen-broad-spectrum-dewormer
You'll need the 500ml bottle for treatment for the long term in eliminating them. You'll need a syringe without a needle to flush the eyes with the 50/50 mixture, as well as dosing orally.
Also, Valbazen kills all other types of worms that chickens can get.
https://www.jefferspet.com/products/valbazen-broad-spectrum-dewormer
You'll need the 500ml bottle for treatment for the long term in eliminating them. You'll need a syringe without a needle to flush the eyes with the 50/50 mixture, as well as dosing orally.
Also, Valbazen kills all other types of worms that chickens can get.