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  • Results 1 to 10 of 10

    Thread: Building a boggy anoxic filter

    1. #1
      One Poet's Garden's Avatar
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      Building a boggy anoxic filter

      Yes, I know I'm being foolish. Yes, I do know better. Yes, I think I should be ordering everything from Roadrunner Acme Pond Supply!

      And I can't even find everything I want. Went to both Lowes and HD looking for egg crate lighting diffuser. No luck. Back to lava rock, darn it!

      Here's the liner, 7' x 10' of shiny 20 mil PVC.

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      Made a jig to cut the 1 1/2" pipe to 22"

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      14 equal sized pieces. Whoops, 22" is too long. Recut them all to 20"

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      Structure center looks like a backbone:


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      Yes, I have a drill press. Yes, it's in the shop 50 yards away. No, I don't feel like walking that far. So it's slits instead of holes:

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      Time for a little glue:

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      I got a Festool TS-75 for Father's Day about 15 years ago. Now the table saw in the shop goes mostly unused. A plunge saw with a very precise track. What's not to like?

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      The gap is 1 1/2 inches, 36" wide. The fall is about an inch. That's a 2x6, so it's about 5 1/2 inches wide.

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      I know most folks are much better at this than I am. I know my methods are way off. My father used to say "Good enough for government work." Or "A blind man will never see it." My old mainframe sysadmin used to say "This ain't no piano we're building." This is about as good as I get:

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      And, of course, I didn't buy enough 2x6s. Back to the lumber yard. No wonder things take so long!

      Thanks,

      Bill
      Last edited by One Poet's Garden; 07-29-2021 at 09:59 AM.

    2. #2
      Paul Sabucchi's Avatar
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      So are you going for the traditional BCB kitty litter and laterite baskets?

    3. #3
      One Poet's Garden's Avatar
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      Quote Originally Posted by Paul Sabucchi View Post
      So are you going for the traditional BCB kitty litter and laterite baskets?
      Grow bags! Grow bags are the future of anoxics!

      With Special Kitty kitty litter and Ironite. Wrapped in old panty hose!

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      I really hope this works!

      Thanks,

      Bill

    4. #4
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    5. #5
      One Poet's Garden's Avatar
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      So I spent part of yesterday running errands and getting supplies. I'm a little surprised at how much this is starting to cost. Kitty litter, gravel, wood, pvc. But it adds up!

      Anyway, in the evening, I got the frame built:

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      One bench will be on this North side, with the greenhouse at the viewer's back:

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      Note the very precise leveling system, involving string and bricks

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      Starting to make some progress on depth. I'm thinking it should be 12 inches. There were tornado warnings, and we had a pretty big thunderstorm in the middle of the work, so at this point, it's not much more than slippery mud:

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      End of day's work. Still in the upper 80's, with incredibly high post thunderstorm humidity. That fogginess in the picture? That's my breath! Y'all have such elegant ponds and civilized lives, but me? I'm mucking around in slippery red piedmont bottomland clay. Where did it all go wrong?

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      Thanks,

      Bill

    6. #6
      Paul Sabucchi's Avatar
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      Nothing elegant or civilized on my end, I just don't advertise the messy bits! Having said that I found my Ridgid laser level very useful - maybe something for next father'day wishlist?

    7. #7
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      I am SOoo excited to see this! I am planning on anoxic on my pond build next year. Yes the costs add up I have been slowly trying to buy some of the things needed. I have been buying the 10x10x8 plant baskets at home depot. Is there a reason for using the grow bags? I plan on stacking the baskets to get more in. How big is your pond? What other filtration are you using? Can't wait to see how this works out for you!

    8. #8
      One Poet's Garden's Avatar
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      Quote Originally Posted by schreiberkoi View Post
      Can't wait to see how this works out for you!
      Thank you for looking in! I think I need to emphasize this is completely experimental, in the category of "Things unattempted yet in prose or rhyme," to quote an old poet. This is true in at least three ways. I've done a lot of research, but I haven't found anyone who uses grow bags instead of baskets. Also, most anoxic filters I've seen are stand alone - a basin filled with baskets, and nothing else. I haven't seen anyone surrounding the baskets with gravel. Third, I'm using modern treated lumber for trim. They changed the treated wood formula 15 years ago so it's far less toxic, but I'm unfamiliar with any studies detailing the effect of the new formula on fish.

      Quote Originally Posted by schreiberkoi View Post
      Is there a reason for using the grow bags? I plan on stacking the baskets to get more in. How big is your pond? What other filtration are you using?
      I was buying plant baskets at big box stores, but there was a supply issue. Still, the real reason I started looking around was because the holes in the baskets let the kitty litter through. So I was having to buy fiberglass screen door material, cut it up, fit it in... it was tedious, time consuming, and was starting to get expensive. The grow bags were pretty porous, but they hold the kitty litter in. They were all recycled - each one had grown a plant for the garden - and I had them on hand. Even new, they are way cheaper: https://www.amazon.com/gp/product/B07MV7RVYF/

      The pond is 7' by 12' by 4' deep. This is the only filtration. The pump is rated for 4,500 gallons per hour: https://www.amazon.com/gp/product/B07FFXXRCT/. 20' of inch and a quarter tubing: https://www.amazon.com/gp/product/B004YK6W72/ , and the water level of the filter is one and a half inches above the pond level. There are some bends in the tubing. I imagine all that cuts down on the gallons per hour, but I don't know by how much.

      There's no bottom drain. I'm not using a 45 mil EPDM liner. It's just 20 mil PVC, and I don't trust it, or myself, to make a good seal around a bottom drain. The pump sits in a large plastic pot at the deepest part of the far end of the pond. And there's no splashing aeration, just a large amount of moving water, and lots of surface area for it to oxygenate. To be honest, I've always counted on splashing for aeration, but I read here that 'splashing is over-rated,' so I'm trying it this way.

      Again, all this is purely experimental, goes against the shared wisdom of many experienced people, and is being done on the cheap. I really don't want to lead anyone astray, because I don't know if this will work. Fingers crossed!

      Best,

      Bill
      Last edited by One Poet's Garden; 08-01-2021 at 02:18 PM.

    9. #9
      One Poet's Garden's Avatar
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      Friday dawned clear, and a little cooler. Time to make some progress. First, I needed a depth gauge, or rather, a screed. I had a piece of 2x12 left over from building the deck stairs, and I just screwed it onto a 2x4:

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      Got it nice and even:

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      I had a bunch of liner cutoffs and scraps of plastic film. Rather than send them to the landfill, I used them for padding:

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      Down goes the heavy duty landscape fabric:

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      In goes the liner:

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      Adding the trim:

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      The PVC structure fits!

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      It's gonna take 40 bags:

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      Each bag got 2" of kitty litter, then 1/2 cup of ironite in old pantyhose, then got filled to the top with kitty litter. it was getting dark by the time I got the bags done

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      Next morning, before anything went in, I tested the cleanout function, using the tubing to siphon the water out. Worked well, took about 15 minutes to drain: the pond is built on a pretty good slope, after all:

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      I wanted about two inches of open space at the bottom, and planned on using egg crate lighting diffuser on top of the pipe structure. Couldn't find a local supplier, so reverted to lava rock, just to give the bags a flat surface to sit on. Of course, the lava rock needed to be cleaned:

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      Ready for the bags:

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      Bags going in:

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      Filled the filter with water, just to test. Kitty litter stayed put, in spite of a 4,500 GPH upflow:

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      "Yes, sir, our bagged gravel is pre-washed and clean." Yeah, right!

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      But it looked good going in!

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      So the major structural things are done. Still need to fix some cosmetic things, and need to add some plants, and get a few goldfish in there. I don't know if a filter like this needs cycling or not. But I can use some of the water from the greenhouse pond filter to get this one going.

      Thanks for any advice you may have!

      Best,

      Bill

    10. #10
      schreiberkoi's Avatar
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      I get the whole experimental aspect but nothing was ever accomplished without first someone trying! I put together some baskets for a small pond that I had string algae in something awful this Spring and could not seem to clear it for nothing. I put 6 baskets in the area under the waterwheel and decided to put plants in .... figured what do I have to lose right? I also put up a shade sail ... was completely in sun with no shade .. so the shade sail may have contributed as well but no more string algae and clear water. Pond is only 600 gallons to grow out baby koi fry but still I am pleased so far with the results. I guess true test will be next Spring when things start up again. Curious as to why you added pea gravel? When I was putting the baskets together I wet the cat litter down first in a small kids swimming pool to get it all to stick together and wash out all the loose. Not saying there is still not a small amount that comes through the planter holes but not enough that it bothers me. I also used the pantyhose and ironite in them I did put a thin layer of pea gravel on just the tops of the baskets to help hold everything in place and thought it might help with putting plants in the baskets but I put penny wort or money penny not sure what everyone calls it and what I call the potato plants just around the outside of the baskets in the voids and they have done great. Excited to see how you like your set up and Thanks for sharing!Name:  small pond.jpg
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