I thought we were copying Ray's pickle barrel idea?
Here's what I did and I will post photos.
3 - 5 gal buckets (cut each bucket in half, leaving each piece about 7" tall)
3- 500' rolls of 1/2" poly ($38 each = $114)
60# bag sakrete ($2 each)
Used cut in half buckets as forms, used 1/2 bag (30 lbs) of mixed crete and added about 90' of poly each, poly about 3' long. The beauty of this is the buckets are forms, therefore easily removed and reuseable.
About $8 each.
Tip! The bottom half of bucket needs to be cut down ONE side to make removal a snap. I simply used a piece of ducktape across the cut to hold it till crete set.
