10. Once the concrete is poured into the mold it is best for it to cure for ten days to two weeks. This will give you a nice solid trough that should last for a long time (figure M). If you are in a rush, you can open the mold in as little as three days, but be careful when removing the molds as the concrete will not be at its hardest state.11. To remove the molds from the trough, remove the screws from the wooden exterior mold and slowly and carefully pry off the pieces (figure N). Then, turn over the trough and remove the foam from the inner mold. There is no need to be careful with the foam, so break it away from the PVC sheet that was covering it. The PVC should peel away from concrete easily, leaving you with a finished trough.
12. Add a drainpipe to the trough at one end at the bottom middle of the wall. Use a hammer drill with a 3/4" drill bit to make the hole. Insert an 8" length of 1/2" copper pipe into the hole, keeping one end flush with the inner wall of the trough (figure O). Fill the gap in the hole with silicone sealant. Use a rubber stopper to plug the pipe.
13. You can add a store bought automatic waterer to the trough to keep your dog(s) in fresh water all year round (figure P). It is recommended that you drain the water in the trough every three to five days; depending on how many dogs you have.
14. The dogs will love this (figure Q) trough!
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