I'm way late on this thread, but I started giving mine the ACV and it cleared up. I believe the heated waterer in the winter was allowing the bacteria to grow, and where it's winter time I wasn't changing the water as often as in the summer. I have continued the ACV regimen and they now get it in their water twice a week and I've had no more problems. Hope this helps. 1 tablespoon of organic ACV with "mother" in it per gallon of water