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    Thread: 4 inch bottom drain recommendation?

    1. #1
      KoiFan84 is offline Member
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      4 inch bottom drain recommendation?

      I’ve heard that the rhino bottom drains are nice, but they’re pretty pricey. Are there any cheaper 4 inch brands that work fine? Bottom drains seem like too simple of a contraption to be costing that much. Thanks.

    2. #2
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      Concrete or liner pond sir?

    3. #3
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      If you are handy you can make a bottom drain pretty easily. Here's mine:
      https://www.koiphen.com/forums/showt...53#post2687253
      Last edited by pickerel; 10-04-2019 at 09:36 AM. Reason: changed link

    4. #4
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      I know cost is a concern but I would not skimp on bottom drains because a failure here can spell disaster. I bought an aerated Koi Toilet to save a few bucks but the construction quality is pure garbage. Everything feels like it's going to break. I also ran a non-aerated Rhino drain and the difference is night and day. Koi Toilet...might as well flush your money straight down the toilet.

      Sent from my SM-G973U using Tapatalk

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      two_wheeled is offline Senior Member
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      I bought my 4" bottom drain from Cascade Pond Supply (here on the forum) for only $49 here.
      It is thick and sturdy and I'm extremely happy with it.
      -Steve in Phx.
      Novice Extraordinaire

    6. #6
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      Quote Originally Posted by two_wheeled View Post
      I bought my 4" bottom drain from Cascade Pond Supply (here on the forum) for only $49 here.
      It is thick and sturdy and I'm extremely happy with it.
      Wow that's a decent price how's the build quality?

    7. #7
      two_wheeled is offline Senior Member
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      Very happy with it. Here's a photo. It came with stainless screws to attach the sealing ring around the liner.
      I also modified it to have a 12" diffuser on top of it, but that's a different story.

      Name:  20180512_144138.jpg
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      -Steve in Phx.
      Novice Extraordinaire

    8. #8
      KoiFan84 is offline Member
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      It's going to be liner. Huh, I've always heard koi toilet is pretty good...

    9. #9
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      Quote Originally Posted by two_wheeled View Post
      Very happy with it. Here's a photo. It came with stainless screws to attach the sealing ring around the liner.
      I also modified it to have a 12" diffuser on top of it, but that's a different story.

      Name:  20180512_144138.jpg
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Size:  113.1 KB
      Better price than the $300 rhino 4inch bd for sure steve

    10. #10
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      Quote Originally Posted by KoiFan84 View Post
      It's going to be liner. Huh, I've always heard koi toilet is pretty good...
      I used the Koi Toilet II's for my midwater pickups and I thought they were pretty well made. I made my
      other ponds BD's out toilet flanges but honestly I probably spent more on all the pieces than if I had just bought
      a KT I and modified it like two wheeled
      --Steve
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      "I know what I have to do now. I got to keep breathing. Because tomorrow the sun will rise.
      Who knows what the tide could bring." --Tom Hanks in Cast Away

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      Wow! $49!?!
      I use an aerated koi toilet, seems to work well. Bought it for $249 I think.
      It’s not built like a tank though and the lid would probably break off if you went in and somehow clumsily stepped on it.
      I went in the pond to retrieve some rocks and since the sloped sides are slippery I found myself sliding to the center and i had to avoid stepping on the BD.

    12. #12
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      Quote Originally Posted by Subersibo View Post
      I went in the pond to retrieve some rocks and since the sloped sides are slippery I found myself sliding to the center and i had to avoid stepping on the BD.
      I haven't had to go in yet but that's what I've always figured would happen to me too!
      -Steve in Phx.
      Novice Extraordinaire

    13. #13
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      Can that bottom drain from Cascade be modified for an air diffuser with a bulkhead fitting?

    14. #14
      two_wheeled is offline Senior Member
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      I modified mine to hold a 12" diffuser on top of it. I wouldn't recommend it to anyone else, as it was a lot of work and it could go terribly, horribly, horrifically wrong, but I did it.
      I think you could accomplish the same thing by placing a large air stone on top of this, or possibly even next to it. That water circulation pattern is what you're after.
      -Steve in Phx.
      Novice Extraordinaire

    15. #15
      drodz is offline Junior Member
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      I added a 9” air diffuser to my non-aerated bottom drain be using two zip ties, and passing them through 4 small holes I drilled to the dome cover of the bottom drain. I also painted the 1/2” pvc air line black so it can’t be seen from the surface. Took me about 10 minutes to do this.

      Hint* it’s easier to do this when the pond is almost empty, unless you have a Scuba equipment or can hold your breath for 5-10 minutes. LoL.

    16. #16
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      I’ve ordered one from Cascade and a 9” air diffuser so I’m going to see if I can modify it with a bulkhead. If not I’ll just use it as non aerated for the new pond build.

    17. #17
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      Suggest you never use non-aerated BD for koi pond system. Way too many advantages with air domes.

    18. #18
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      Quote Originally Posted by two_wheeled View Post
      Very happy with it. Here's a photo. It came with stainless screws to attach the sealing ring around the liner.
      I also modified it to have a 12" diffuser on top of it, but that's a different story.

      Name:  20180512_144138.jpg
Views: 323
Size:  113.1 KB
      Did you use a fernco fitting?

      Other Sites Sale prices are our everyday prices.
      Vice President Oregon Koi and Watergarden Society


    19. #19
      two_wheeled is offline Senior Member
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      Quote Originally Posted by Billy View Post
      Did you use a fernco fitting?
      To connect the BD to the 4" PVC drain pipe, honestly I can't remember if I glued it or used the fernco fitting. I "think" I remember using the fernco, but I can't find it in my photos. It's all enclosed in concrete now so I think it'll take a hundred years for someone to find out.
      -Steve in Phx.
      Novice Extraordinaire

    20. #20
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      Diy bd

      You can build a DIY BD fairly easily....especially if it is not for use with a liner.
      Attached Images Attached Images

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