I have been putting apple cider vinegar in their water for quite awhile.....but to take care of the algae. It works for that by the way.Someone on another thread rec'd giving them some apple cider vinegar in their water to jump start laying...I was skeptical (but it does help boost my horse's appetite when he goes off feed, so, I figured 'why not')...seemed to really help my EE. Granted they were pullets (and it might just have been their time to up egg production)...but I was only getting an egg every couple days from those three EE...now I'm getting 2-3 every day.