PopoMyers
Free Ranging
I need some of that! Looking to see if we have it here in the US. Anytime water stands for a time with dirt in it, roundworms appear, so must be a lot of eggs in the soil.I use Ivermectin for mites coupled with either Red Stop or Oblitermite which make the chicken's blood unpalatable to red mite via a herbal mixture. The Ivermectin de-worms for practically everything except tapeworm and some capillary worms, as well as killing most mites.
I've never had a worm problem before, generally the worm count I do every 3 months comes back with less than 50 worm eggs for the entire flock!
I also use a product called bio-oo-cyst which is watered round the run to kill worm eggs but I've not used it as much this winter. it's just been too wet underfoot.