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Thread: sealing a block wall pond

  1. #1
    Meg
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    Oyagoi Meg's Avatar
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    sealing a block wall pond

    short story is after 5 years the sani-tred on my pond has failed.
    after spending many hours tediously pealing the sanitred off the pond I am nearly ready to decide how to go forward.
    does anyone here have some knowledge of Ulraguard?
    the video on their web site discribes exactly what happened to my failed sealant! chalked, blistered and pealing

  2. #2
    Honmei ricshaw's Avatar
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    Quote Originally Posted by Meg View Post
    short story is after 5 years the sani-tred on my pond has failed.
    after spending many hours tediously pealing the sanitred off the pond I am nearly ready to decide how to go forward.
    does anyone here have some knowledge of Ulraguard?
    the video on their web site discribes exactly what happened to my failed sealant! chalked, blistered and pealing
    Can you give us URLs for the products mentioned above?

    I am not familiar with "sani-tred" or "Ulraguard".

    I am familiar with sealing a concrete block wall pond with 50/50 silica sand/ cement plaster mixture.

  3. #3
    Oyagoi kntry's Avatar
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    How do you seal it with silica sand and cement plaster? I need specifics. Does this require a coat of some type of sealer?

    DIY Wet Basement Waterproofing, Finishing & Flooring, Swimming Pool, Deck & Concrete Crack Repair, Roof & Industrial Floor Coating

    Epoxy Swimming Pool Paints

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    Honmei ricshaw's Avatar
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    Quote Originally Posted by kntry View Post
    How do you seal it with silica sand and cement plaster? I need specifics.
    Does this require a coat of some type of sealer?
    The two coats of 50/50 plaster mix of silica sand and cement water proofs the concrete enclosure and does not require any additional sealer coat.

    Adding an additional "sealer" coat has the advantage of shortening or eliminating the leaching of the cement lime (high pH) into the pond.
    The disadvantage of adding a sealer coat is the higher cost and the chance later on of the sealer coat peeling off.

  5. #5
    Oyagoi kntry's Avatar
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    What cement do you mix with the sand? How thick are the coats?

    Would I wash this down with Muratic acid?

  6. #6
    Honmei ricshaw's Avatar
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    Quote Originally Posted by kntry View Post
    What cement do you mix with the sand? How thick are the coats?
    I was told to use regular cement (I think it is Portland cement), not plastic cement.
    This was 30 years ago.
    Both come in bags (around 90 lbs.) and sold at most home improvement stores.

    The plaster coat is fairly thin, less than 1/4 inch.

    Would I wash this down with Muratic acid?
    Most people just add the Muriatic acid (vinegar is safer) to the pond water during the curing time. When the pH stables (only 0.2 - 0.4 above the tap water), you do a complete water change, add declor and test fish.

    On my second pond I did a diluted Muriatic acid wash.
    Dangerous, the fumes can harm you.

  7. #7
    Oyagoi kntry's Avatar
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    Have you built a pond this way without it leaking and if so, how long ago?

    This would be much easier and cheaper than using a sealer.

  8. #8
    Honmei ricshaw's Avatar
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    Quote Originally Posted by kntry View Post
    Have you built a pond this way without it leaking and if so, how long ago?
    Yes, two ponds using concrete block and one pond using Shotcrete over poultry wire.
    All three were water proof using 50/50 cement and silica sand plastering for water proofing.

    Note: The "50/50" plaster is only as strong as the concrete pond it covers.

    The first pond built in 1979 did not leak until the pond cracked between the concrete block set on concrete patio and the bowl shaped concrete pond bottom which was only a couple inches thick. The leak was the result of a structure crack and not the fault of the "50/50" plaster.

    The second pond was built in 1981 using Shotcrete and "50/50" plaster plus a cement product that you "paint" on with a brush for water proofing.
    The pond still today holds water but in 2000 developed a crack that I repaired using an epoxy substance called RayCrete <click on> that is not available today.
    My web site host "lost" the pictures through server changes, so I have included the following picture.



    My third pond, still holding water today, was built about 25 years ago with a better footing for the concrete block sides and a thicker, better reinforced poured concrete pond bottom. There is also a 5' x 6' concrete filter box built with similar construction technique as the pond except morter-less concrete blocks were used.
    All concrete blocks are reinforced with rebar and filled with concrete and sealed using the "50/50" plaster.

  9. #9
    Honmei ricshaw's Avatar
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    I was able to retrieve a couple more pictures of my concrete pond crack repair.

    The first picture is after I "opened up" the crack with a chisel.



    Now that is what I call a CRACK!!

    The second picture is after the RayCrete epoxy adhesive/filler has had a chance to set up.


  10. #10
    Jumbo bighatbulls's Avatar
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    sorta looks like expanding foam.

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