Instead of a kiddie pool I dug a small pond in the yard and lined it with
1" of mortar. About 4' in diameter and 8"-10" deep in the center with
gently sloping sides kind of saucer shaped. This can be swept out clean
with a push broom in minutes which is neccessary just about every day. I
planted an orange tree just downhill from the duck pond and it sure seems
to like the green slimy stinky water. -RP