Things You'll Need
- Wooden slats
- Hammer
- Nails
- Plastic sheeting
Instructions
Place wooden slats around the perimeter of your koi pond. They will act as a barrier. The concrete needs to be completely submerged in water to cure.
Hammer the wooden slats in place around the edge of your pond if possible. Weigh them down with rocks or bricks if they cannot be nailed in place.
Attach plastic sheeting to the wooden slats to form an airtight surface. Attach the plastic sheets so that they cover the area where the wood sits against the ground to prevent water from seeping out.
Fill your koi pond with water, up to the level of the barrier you created. To cure properly, concrete needs to be kept at 100 percent humidity.
Leave the concrete submerged for three to seven days. Although a seven-day period will give you the most effective curing of the concrete, a three-day period will also suffice.
Drain the koi pond after three to seven days and replace the water with fresh, clean water, or begin running a filtering system to remove any impurities left by the cured concrete before adding your koi to the pond.