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  • Page 2 of 2 FirstFirst 12
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    Thread: Filtration Basics

    1. #21
      cindy's Avatar
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      Quote Originally Posted by froto123 View Post
      Can anyone give their thoughts on bog filter as the only filter on the pond?
      A bog filter is hard to clean unless it has a bottom drain and then the solids are trapped on top.

    2. #22
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      Also, to be effective, a true "bog filter" is an actual bog at least 1/3 the square feet of the pond. If done properly, the true bog would never need to be cleaned.

      steve

    3. #23
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      Steve...is there a thread somewhere in this forum that explains how to make a proper bog? Thank you.

    4. #24
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      Not in this thread. Waterbug and Monomer have experience with them. Send them a PM.

      steve

    5. #25
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      your avatar is funny !!

    6. #26
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      Great thread !!!

    7. #27
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      Hi, I have a 1300 gallon pond, and I am planning to build a DIY biofilter. As I am searching the net - it seems that in all the designs the filter is outside the pond. Is there a reason for this? My plan is [was] to make a submersible filter, but now I have my doubts. Can someone please be so kind as to tell me what is wrong with my logic?

      What I plan is a tote box, sitting on the bottom, connected to my pump. Forgive my hand drawn diagram! I have a 2000g/h pump, and was planning to line the tote with filter sponges --> bioballs --> carbon.



      The reason I have for making it submersible is to hide the setup, and not have an eyesore outside.

      I would like any suggestions, please.

    8. #28
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      Quote Originally Posted by lumka1 View Post
      As I am searching the net - it seems that in all the designs the [bio] filter is outside the pond. Is there a reason for this? My plan is [was] to make a submersible filter, but now I have my doubts.
      Bio filters consume huge amounts of oxygen and therefore work better when exposed to the atmosphere. It is much harder to properly oxygenate bio filters when submersed.

      Equally important, when constructed correctly in the form of a bakki shower, bio filters off-gas some ammonia before converting it into nitrites. This benefits the fish as less nitrates are produced by the ammonia-nitrite-nitrate cycle taking place in the bio filters. The ammonia-nitrite-nitrate cycle is a necessity, but something we would like to slow down if there are other ways of dealing with the buildup of ammonia.

    9. #29
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      I have just read the BDset up and think that I have maybe messed up. My bottom drain was gravity feeding into a settlement tank and from there I had two pumps sucking out of that tank (one to my biological filter and the other to my waterfall, jets and a Bakki filter. I wasn't happy with the color of the water going into my Bio filter (it was clean clean) so I connected the bio filter pump directly to the BD the second pump was hooked up to suck out of the settlement tank through a sand/bead filter then onto the waterfall. I am now seeing clear water but with lots of fines in it.......I think I need to revert back to having the BD gravity feeding back into the settlement tank.
      What do you guys think??

      Neil
      Come and see what else I get up to HERE
      Neil

    10. #30
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      Youíre not properly gravity fed if your pumps are before the filters, youíre pump fed. You happen to be pushing your water through your filter from a sump. Itís all arsed about face.
      Youíre probably getting a percentage of your waste macerated by the pumps which then isnít getting removed by whatever mechanical filtration you have, if any? Perhaps thatís why youíre experiencing the ďfinesĒ in the water.
      Are you filters above the level of the pond?


      Sent from my iPhone using Tapatalk

    11. #31
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      Quote Originally Posted by bigcarpchaser View Post
      You’re not properly gravity fed if your pumps are before the filters, you’re pump fed. You happen to be pushing your water through your filter from a sump. It’s all arsed about face.
      You’re probably getting a percentage of your waste macerated by the pumps which then isn’t getting removed by whatever mechanical filtration you have, if any? Perhaps that’s why you’re experiencing the “fines” in the water.
      Are you filters above the level of the pond?


      Sent from my iPhone using Tapatalk
      Yes Sir, My filters are above ground level. What I am going to do is this. I will disconnect my main pump from the bottom drain, I will then connect the bottom drain line to a new Draco RDF and let the BD gravity feed the RDF. The RDF will be mounted in my settling/suction pit. I will then have my main Bio filter pump and my converted sand filter pump suck pre flittered water out of the suction tank into both of the filter systems.........................does that sound about right?
      I just hope the 3" BD line is going to be bug enough.
      Neil
      Come and see what else I get up to HERE
      Neil

    12. #32
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      Quote Originally Posted by ndwgolf View Post
      Yes Sir, My filters are above ground level. What I am going to do is this. I will disconnect my main pump from the bottom drain, I will then connect the bottom drain line to a new Draco RDF and let the BD gravity feed the RDF. The RDF will be mounted in my settling/suction pit. I will then have my main Bio filter pump and my converted sand filter pump suck pre flittered water out of the suction tank into both of the filter systems.........................does that sound about right?
      I just hope the 3" BD line is going to be bug enough.
      Neil
      Just waiting for the RDF. I'm back gravity feeding the suction pit from the BD ( some sad news one of my $150 koi had been sucked into the suction line and was jammed in the check valve) we have modified the bottom drain cover to make sure that doesn't happen again.
      Once the RDF arrives it should be a straight forward hook up.
      Neil

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    13. #33
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      It still seems a bit Heath Robinson to me.
      Can you lower your filters to the same level as your drum and locate the pumps after?


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    14. #34
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      Don't know what a suction pit (?!) is but pond pumps are designed to push water, not pull it. If any redesigning is going on, try to keep that in mind if you can Neil.

    15. #35
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      Neil, just noticed the thread this is posted in. I'd start a new one for your issues rather than dilute this focused sticky one

    16. #36
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      Quote Originally Posted by perniciousviper View Post
      Don't know what a suction pit (?!) is but pond pumps are designed to push water, not pull it. If any redesigning is going on, try to keep that in mind if you can Neil.
      It's a pit that you suck fluid out of. Like putting a Straw in a milkshake and sucking on it. If you push/blow on it you will get a face full of milkshake

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    17. #37
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      Quote Originally Posted by bigcarpchaser View Post
      It still seems a bit Heath Robinson to me.
      Can you lower your filters to the same level as your drum and locate the pumps after?


      Sent from my iPhone using Tapatalk
      It would be impossible to lower the filters. They are at ground level and the pond is under ground level.
      My understanding of the RDF (very limited by the way) is this.
      My bottom drain is a 3 inch line that gravity feeds into my suction tank that is a 1m X 1m X 1m tank
      Picture below on the right.



      I will connect the supplied 3 inch flexible hose to the RDF inlet that will be located inside this suction pit.
      After the gravity fed fluid passes through the RDF and the RDF does its job clean fluid will then discharge into the same 1m X 1m X 1m tank at the same time all of my filter pumps (3 of them) will suck clean pond fluid out of this tank and into the various other filters that I have in my filter system........ie Bio Filter, Bakki Shower, converted sand filter, protein skimmer.
      I just wish my bio filters would hurry up and kick in......my fish are starting to look hungry
      Speaking of which another member on here who also lives in Phuket is going to give me a bag of his bio media next week when he cleans his filters........ hopefully that will speed up my bio process
      Neil

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    18. #38
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      Mods, can you move these recent posts to another of Neil's threads - or the one he is about to start - in the main construction forum please as they are

      Neil - not really following what your posts are about but maybe start a new thread for them away from this sticky?

    19. #39
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      Quote Originally Posted by perniciousviper View Post
      Mods, can you move these recent posts to another of Neil's threads - or the one he is about to start - in the main construction forum please as they are

      Neil - not really following what your posts are about but maybe start a new thread for them away from this sticky?
      Okay

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