It's been a week and I would have to give the copper pipe in a birdbath theory a solid B.
Now, the water is not crystal clear. I wouldn't be throwing on my bathing suit and diving into it quite yet.
Because it seems the other half of my problem with the birdbath is the stuff the birds drag in. Worms. Poop. Other unidentifiable bird filth.
The copper won't help you with that type of bad bird behavior. But the green gunky algae, that I used to have to clean out of here every few days, has slowed down quite a bit.
I think I will still have to change the water at least once a week, but that is still better than changing it every other day and cussing at the #*$& birds as I do it.
Birds are nasty little creatures. Thank God He made them pretty.