Took a year off between building the pond and the QT, I was pretty beat and had some landscaping to do that included moving 11,500 pounds of rock delivered to the driveway in the front, to the back via wheel barrow. I had a Rubbermaid tank for QT if needed as temporary solution.
This tank is 8x4x3 exterior dimensions, closer to 7.25x3.25x3 once finished. Should be just north of 600 gallons.
2x6 interlocking frame construction using 2.25 inch screws to secure verts 12” on center.
The frame is in two layers, like many before me. The bottom layer verts are 12” long and top are closer to 15” long. I did this to position that triple stacked 2x6 horizontal spine down lower to the ground where there’s more water pressure. I have not seen others offset like this, and with 2x6 I’m sure it’s entirely unnecessary, but why not just over think and complexify?
Carriage bolts in the corner of the horizontal mid-spine to help connect the sides, and lag screws in the corner of the footing.
pressure treated lumber on the bottom.
1/4” cement board on the outside as I will veneer it with rock to match pond. 1/2” plywood on inside. Still need to put foam around plywood for extra protection.
It will be liner inside. Pics are next!