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    Thread: Concrete pond..need some help so I can add fish and fitration

    1. #1
      sachin is offline Junior Member
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      Concrete pond..need some help so I can add fish and fitration

      Hello,

      I have a 15ftx4.5 ft x4.5 foot concrete pond, between 2500 and 2800 gallons when filled. The concrete had xypex mixed in it and was poured by a contractor about 4.5 weeks ago. I just had it sealed again with xypex concentrate about 3 days ago. Based on all of my reading, I understand that there should be no issues with leeching if I have used xypex, but I am still planning to monitor pH before I add any fish. (I will need to buy fish)

      Here is my question. The coating of the xypex has left the pond walls rough to the touch..i.e. they are not smooth. I am not sure if this is okay OR does this damage the fish? When you folks have used concrete and Xypex - is it very smooth?
      If yes, what do I need to do?

    2. #2
      sachin is offline Junior Member
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      Here is a picture of the inside see what I mean by not smooth..
      Please help.
      Name:  20200603_163220.jpg
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      One side of the pond
      Name:  20200603_163404.jpg
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Size:  109.9 KB

    3. #3
      trapper is offline Senior Member
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      Was the concrete finish smooth and the Xypex is what's rough?

    4. #4
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      Time to get grinder and scraper out and smooth everything out. Lots of work
      -Tony
      KoiTime USA Vlog
      https://www.youtube.com/channel/UCJY...lOsl9hsezbmzSQ
      1st house paid off at age 36 bought 3/2016 4 years and 3 months

    5. #5
      audioenvy is offline Supporting Member
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      Scrape/grind out the big stuff. Coat with marine-safe paint. Wait a full week before adding water.

    6. #6
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      Quote Originally Posted by sachin View Post
      Hello,

      I have a 15ftx4.5 ft x4.5 foot concrete pond, between 2500 and 2800 gallons when filled. The concrete had xypex mixed in it and was poured by a contractor about 4.5 weeks ago. I just had it sealed again with xypex concentrate about 3 days ago. Based on all of my reading, I understand that there should be no issues with leeching if I have used xypex, but I am still planning to monitor pH before I add any fish. (I will need to buy fish)

      Here is my question. The coating of the xypex has left the pond walls rough to the touch..i.e. they are not smooth. I am not sure if this is okay OR does this damage the fish? When you folks have used concrete and Xypex - is it very smooth?
      If yes, what do I need to do?
      If Xypex was added into the concrete then why was it applied to the surface? That just doesn’t make sense. Get a grinder and grind all of the surfaces smooth
      people like to vehemently defend their purchases and find it incredulous that anything could be better

    7. #7
      Russell Peters's Avatar
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      Quote Originally Posted by audioenvy View Post
      Scrape/grind out the big stuff. Coat with marine-safe paint. Wait a full week before adding water.
      You sure about waiting a full week?
      people like to vehemently defend their purchases and find it incredulous that anything could be better

    8. #8
      audioenvy is offline Supporting Member
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      Quote Originally Posted by Russell Peters View Post
      You sure about waiting a full week?
      Easier to wait if it's someone else's pond.

    9. #9
      sachin is offline Junior Member
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      Quote Originally Posted by trapper View Post
      Was the concrete finish smooth and the Xypex is what's rough?
      Concrete was relatively smooth, not perfect.. but with the Xypex concentrate, it feels rougher when I slide my hand on it.

    10. #10
      sachin is offline Junior Member
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      Quote Originally Posted by Russell Peters View Post
      If Xypex was added into the concrete then why was it applied to the surface? That just doesn’t make sense. Get a grinder and grind all of the surfaces smooth
      Based on some other threads here, it seemed good as an extra precaution (overkill even), but I decided to do it as it is my first Concrete pond.
      When I called my contractor back, he said grinding will probably remove the Xypex, so best to add a plaster of some kind and make it smooth..

      Can I use some layer of paint on top of this and smooth that? versus having to grind the concrete off..?

    11. #11
      sachin is offline Junior Member
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      Quote Originally Posted by audioenvy View Post
      Easier to wait if it's someone else's pond.
      Audioenvy. haha. No problem in waiting as I am still waiting on pond equipment, I plan to run that without fish for a week or two before adding fish.. Plan to get fish in by July - so no problem in waiting.

      WHat is marine grade paint that can be used on top of the xypex that doesn't reduce the crystallization property of xypex and still make the sides smooth for fish to not scrape themselves.

    12. #12
      icu2's Avatar
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      I used block and Xypex but coated the block with mortar before applying the Xypex... which really didn't do much,
      but mine was kind of rough and doesn't seem to matter to the fish. The Xypex Concentrate rolled almost like paint
      so on mine it didn't seem to add any roughness. If you're going to paint it you might as well grind it since the Xypex
      works by getting wet so if it's sealed with paint it's not going to do anything anyway.

      Also, Xypex doesn't seal it from pH swings. My pH was very high but a couple weeks it was back to normal and has
      never changed in several years. Test on the left is when the pond was filled and one on the right is after 2 weeks.

      Name:  pH lower pond.jpg
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      --Steve


      In the beginning of a change the patriot is a scarce man, and brave,
      and hated and scorned. When his cause succeeds, the timid join him,
      for then it costs nothing to be a patriot.

      ---Mark Twain

    13. #13
      Paultergeist is offline Senior Member
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      I am no expert in these matters, but just asking.......what about a more hybrid approach:

      Grind down the really prominent areas....
      Then re-coat -- possibly a couple of coats -- with a Xypex slurry? Maybe with a roller.....so it flow like a heavy paint coating? Might that result in an acceptable option? Just wondering?

      I am also thinking that -- over time --a good layer of carpet algae might make a lot of this disappear.

    14. #14
      icu2's Avatar
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      Quote Originally Posted by Paultergeist View Post
      I am no expert in these matters, but just asking.......what about a more hybrid approach:

      Grind down the really prominent areas....
      Then re-coat -- possibly a couple of coats -- with a Xypex slurry? Maybe with a roller.....so it flow like a heavy paint coating? Might that result in an acceptable option? Just wondering?

      I am also thinking that -- over time --a good layer of carpet algae might make a lot of this disappear.
      At least where I am Xypex is a challenge to obtain. I could buy it at a wholesaler but only in 50# bags at $125 ea., and that was years ago.
      But no reason it couldn't be done. A roller is how I applied mine:

      Name:  Image6.jpg
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      For whatever reason my block pond hasn't ever grown the algae like the other liner pond has. There's some but it's a fraction of the liner
      pond... just fwiw:

      Name:  image 1.jpg
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      --Steve


      In the beginning of a change the patriot is a scarce man, and brave,
      and hated and scorned. When his cause succeeds, the timid join him,
      for then it costs nothing to be a patriot.

      ---Mark Twain

    15. #15
      OCkoiFan's Avatar
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      Pond Amor might be best for this application now
      It will give an epoxy surface
      The problem is price and pain in the rear to apply
      M.Nguyen


    16. #16
      Russell Peters's Avatar
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      Quote Originally Posted by sachin View Post
      Based on some other threads here, it seemed good as an extra precaution (overkill even), but I decided to do it as it is my first Concrete pond.
      When I called my contractor back, he said grinding will probably remove the Xypex, so best to add a plaster of some kind and make it smooth..

      Can I use some layer of paint on top of this and smooth that? versus having to grind the concrete off..?
      Just grind it off. I can tell you from experience that what you did was a total waste of time and your contractor should have know that, if it is added in the concrete, there is absolutely no reason to skim the surface with it. Xypex continues to migrate through the concrete over time as moisture comes in contact with it. Paint will make no difference in smoothing it out enough.
      people like to vehemently defend their purchases and find it incredulous that anything could be better

    17. #17
      sachin is offline Junior Member
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      sounds good Russell.

    18. #18
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      Isnt there some additives one can add to the slurry mix to make it waterproof directly from concrete factory or onto the truck to mix pre-pour?
      -Tony
      KoiTime USA Vlog
      https://www.youtube.com/channel/UCJY...lOsl9hsezbmzSQ
      1st house paid off at age 36 bought 3/2016 4 years and 3 months

    19. #19
      Russell Peters's Avatar
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      Quote Originally Posted by Nguyen365 View Post
      Isnt there some additives one can add to the slurry mix to make it waterproof directly from concrete factory or onto the truck to mix pre-pour?
      Yes, in the very first post he said Xypex was added to the concrete for the pour.
      people like to vehemently defend their purchases and find it incredulous that anything could be better

    20. #20
      ndwgolf's Avatar
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      Quote Originally Posted by Russell Peters View Post
      If Xypex was added into the concrete then why was it applied to the surface? That just doesn’t make sense. Get a grinder and grind all of the surfaces smooth
      Why does the concrete need to be smooth?

      Sent from my VOG-L29 using Tapatalk
      Come and see what else I get up to HERE
      Neil

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