To keep algae growth from your bird bath drop some pre-1982 copper pennies in. I have what I would call a normal size bird bath & I use 7 pennies. The reason for the pennies being pre-1982 is that before that year, the pennies contained copper, a natural algicide.
Worlds most perfect fertilizer + pesticide is epsom salt. This is so true- every other week- 1 gallon of water, 1 TBSP of miracle grow and 3 TBSP of epsom salt- I promise a great garden all seas - Click image to find more diy crafts Pinterest pins