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  • Results 1 to 6 of 6

    Thread: Concrete Pond Leaking

    1. #1
      aranki is offline Junior Member
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      Concrete Pond Leaking

      I joined this forum to learn from membership expertise. I have a 1500 Gallon Koi concrete Pond. The pond is a Pizza slice shape with an average depth of 33 inches. It is below and 18 inches above ground. I installed a Pondmaster Clearguard Pressurized Filter up to 5500 GAL (WITH 18 Watt UV Light). I also built a 55 gallon Koi pond stone and gravel filter that removes sediments with a bio filter balls at the bottom for extra filtering It was designed to have a water fall and a 3Ē bottom drain and side jets for water circulation. I used a Quiet Drive External Pump (4200gph) with a priming pot. I also have a Helix Pond Skimmer installed.
      The pond turned out bigger than I expected but it looks great and all equipment and systems work great. Except for one big issue. The pond leaks. Not sure what is leaking or where. I used Drylok to waterproof the pond and used 4 coats of the stuff. Water collects on both sides of the pond where dirt is exposed, and also on the bottom of wall in front of the pond (see pictures). Iíve been troubleshooting it for 8 months now and everything that I thought it was and fixed turned out not to be the cause.
      Troubleshooting and fixes taken:
      1. Waterfall piping, Turned off water for the waterfall, no help (rule waterfall piping out)
      2. Skimmer piping, lowered the water below the skimmer opening, no help (rule Skimmer Piping out).
      3. 3 inch bottom drain piping, Plugged drain with 3 inch plug, No help (ruled drain piping out)
      4. Water Jet piping, removed water jets and Plugged all 5 jet output holes and closed both jet piping valves, no help (ruled water jet piping out).
      5. The concrete was sealed with 4 coats of DryLok. There are no visible cracks in concrete or at least cracks that I can see.
      The only plausible cause is that the concrete is leaking, but the concrete wall and bottom is almost foot and a half thick and I have 4 coats of DryLok on it. When I settled on DryLok, I thought that itís a good sealer, isn't that so? Any other water proofing material that may go over DryLok?

      Any ideas or pointers would be much appreciated.
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    2. #2
      tinyfisher's Avatar
      tinyfisher is offline Senior Member
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      Is that poured concrete or concrete block?

    3. #3
      Nguyen365 is offline Senior Member
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      Such a beautiful pond what a shame. You’ll have to find out where the leak is and patch. A lot of people who do concrete pond use fiberglass which is expensive and almost never leak.

    4. #4
      aranki is offline Junior Member
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      its poured concrete.

    5. #5
      pickerel's Avatar
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      I love the design of your pond. I wish I could help solve your problem. Hopefully some of the concrete experts will chime in soon.

    6. #6
      Grumpy's Avatar
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      Please provide some more information.

      How fast is the pond going down? Has the rate of loss/week remained constant over the last 8 months?
      When you plugged the bottom drain lines (and others) did you vacuum the water from the lines to be sure your plugs were tight and the pipes remained dry?
      If you lower the pond 6", does it continue to lose depth? Have you done this over varying depths?

      I think the easiest way of finding the leak is allowing the pond to go down till the rate of leak slows and/or stops.

      If the pipe plugs were tight and the piping isn't the cause, it is possible it is leaking at the pipe penetrations at the interface between the pipes and concrete. Allowing the pond to go down will reveal that as well as a crack in the liner.

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