Although it is a pretty color (?), I am having a problem with pink algae. We have 2 homemade waterers constructed from PVC. There is a clear tube along the side which lets us know when the water is running low. Is there anything can I do, other then constantly washing the waterer out, to get rid of this icky stuff? I add ACV to my gallon water jug and then fill them from that. Water is mixed as needed and always fresh. Any suggestions?:/