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The thread is a bit long and there's good info there and some not the best. Look specifically at the posts made by Hen Pen Jem and Coach723. Use the Filter at the top of the page, click on the 3 dots to click on "who replied" this will give you a drop down, then click on one of those people...

You may find this thread helpful. https://www.backyardchickens.com/threads/colloidal-silver-dosage.1277070/