How to Seal Concrete Ponds to Hold Water

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Things You'll Need

  • Wet/dry vac

  • White vinegar

  • Water

  • Household mop

  • Garden hose

  • Concrete sealant

  • Paint brush

  • Mask

  • Rubber gloves

An outdoor concrete pond can add beauty and sophistication to any external living space. A pond that is not properly installed or sealed is more vulnerable to leaks and cracks, which will cause damage that will require a costly repair. Save time and money by applying a concrete pond sealant yourself, which can be purchased at many hardware and pool supply stores. The sealant should be applied in thin coats and will take several hours to dry before any flora or fish can be placed inside.


Step 1

Drain the pond of all its water.

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Step 2

Allow the pool to dry for at least 12 hours. Remove any dirt or debris from the bottom and sides of the pool with a wet/dry vacuum cleaner.

Step 3

Prepare a mixture of one quart white vinegar for every 10 gallons of water.


Step 4

Dip a household mop into the solution and clean the sides and bottom of the pool. Apply pressure to any areas that have stubborn stains or algae.

Step 5

Rinse the pool with a garden hose. Allow the pool to dry completely before continuing.


Step 6

Apply a thin coat of concrete sealant with a paint brush. Use back and forth even strokes to apply an even coat. Wear a mask and rubber gloves while applying the sealant to avoid inhaling any fumes or allowing the sealant to come in contact with your skin.

Step 7

Allow the first layer of sealant to dry completely before applying a second and third coat.

Step 8

Allow the final coat to dry completely before adding any water, plants or fish to the pond.


A layer of concrete paint can be applied over the sealant to change the color and appearance of the pond.


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