Pond filtration


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Hello all,

I just recently bought a new house down in Laredo TX that had a small pond in the back yard. The pond was not running so I have been working on it slowly. It has a small over flow where once it fills up it flows back into the pond through 3 small copper pipes. In the bottom of the over flow it has a wire grate that has about 5-6”s of clearance under it. When I took it out there was some kind of growth under it. Reminded me of like peat moss. Not sure if that was there to help filter or if it grew there due to who lived there before me filling the whole thing up with dirt and rock and putting flowers and plants in it. Should I put something back under the grate to help filter the water or do I just need to add some kind of filtration system?
91685414-FF9D-494C-96D0-2D5C33B6BCAC.jpeg
 

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I believe the wire grate is to create a void (nothing below the grate) and you put filter media on top of the grate
 

brokensword

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So what would be a good filter media to put on top?
Matala pads. If there's nothing else in the filter, you could also consider some sort of bio material (balls, ribbons, shreds of pvc, lava rock, etc) as this will give you both a mechanical (the pads) and bio filter. The bio portion is important as that's where the bacteria (the good ones) colonize and break down the bad things in your water (the ammonia, then the nitrites). Plants will take up what is left, the nitrates, so I'd add many of those.
 
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you have the makings to build a bog hands down the easiest least amount of maintenance money can buy all you need to do it put a couple 2 inch pvc pipe at the bottom of the raised area cut slots in the pvc 1/3 through the pipe every 6inches and then fill the raised area with 3/8 pea stone but keep it about 4 inches down from your drain pipes. And you will never look back or regret building the bog
 

brokensword

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I have something similar to that in the main pond. The pump pulls the water through the pvc pipe and fills the overflow.
there's a fundamental difference; a bog has water PUSHED into it at the bottom so it can then be forced up through gravel and plants, where it pours back into the pond. That's what GB is intimating. A pump works much better at pushing than pulling. I didn't think of that when I first saw the pics but it really would work well for you (bog filtration).
 
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Same principle. But like @brokensword said the bog has that in the bottom and the water is pumped below the gravel and forced up through the gravel basicly mother nature's pressure filter. As the gravel gets blocked in one area the pressure builds and finds another way up through the gravel and plant roots. Phosphates are a nightmare to mechanical remove from water with any man made chemicals or filters. Mother nature has plants do the job they thrive on phosphates , nitrates and all the algae growing goodies we hate.
 
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@poconojoe HAS quick little bog post there check it out it will give you the principles. Of the bog . That and most here who do have a pond has there's in a link at the bottom of there posts
 
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addy1

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If it were mine I would load up the box with pea gravel, after adding some slit pipes to the two that are in the bottom of that area. Have the end of those two pipes capped so the water is forced up. Plant some nice small bog plants, like water willow, blue forgetmenot. etc. You would have great filtration and a neat planter of plants. There are a lot of plants that like to be wet and bloom great. Including impatiens.
 

addy1

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And Welcome to the forum!

That is a beautiful pond.
 
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Including impatiens
We don't mention impatience enough any guy who wants to build a pond and the wife is on the fence about it should see how Huge they grow in a bog or just laying along the pond. It's miracle grow on steroids
 
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Agree, that small upper section is absolutely perfect for a bog filter. That's the first thing I thought when I looked at the picture.

Most of the work is already done for a bog. The main container is already there. Just add the manifold and cover it with pea gravel and you'll have a maintenance free filter. No filter pads to rinse, just enjoy clear water. No other filters or UV lights are necessary.

Grow plants directly in the gravel, no pots.
As the plants grow, it will just look like a garden. No one will even know there's a complete filtering system under there.

Here's my add-on bog build that GBBUDD mentioned...
 
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ok so I put the pvc pipe on the bottom and drilled 1/4” holes in it for the water to come through. So, now put the wire grate back over it and put in the pea gravel for the water to filter through?
2DB9C3B8-C76D-4227-8763-8888C4EE4486.jpeg
 

addy1

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drilled 1/4” holes in it for the water to come through.
I would flip the pipe over so the holes are down. Pea gravel likes to drop down and plug holes, Mine is all slits chopped with a saw. All the slits pointing down. OW no need for the screen or add if you want, if it is a fine screen it might get plugged with silt etc and not flow as well. You will love how it helps take care of your pond.
 
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brokensword

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ok so I put the pvc pipe on the bottom and drilled 1/4” holes in it for the water to come through. So, now put the wire grate back over it and put in the pea gravel for the water to filter through? View attachment 137983
ah, I think you might have missed something in translation; there's no obvious input for the water to get into your manifold pipes. You need an ingress, so you need to cut the pipe, put in a tee, then work the pvc up to your input pipe (flex pvc?). I'd also add a union at that junction.

Second thought; 1/4" holes are pretty small if you have any sort of pump flow. Recommended is to cut slits, 1/3 the way through the pipe. You need a better way for the water to flow out. Take a circular saw and slit at every other drill point, along the main run, not the sides; that should do it.

Third thought; you may not want to hear this, but it would be better if your manifold pipes went down the center and not along the sides. Why, you ask? Because as the gravel above gets root-bound or slightly clogged, the water will force itself up along the wall sides instead of up through the gravel as you want it. The changes I'd make then are; two manifolds with slits now, a tee for getting the pond water into the manifolds, a union at the top to disconnect your hose if you ever need to, and manifolds going down the center, not along the sides.

Fourth idea; you may not have enough outlet flow area to handle the water you're going to put in. Watch it as your bog water height might start rising faster than those two outflow pipes can return it. You may need another or wider pipes. Just something to keep an eye on. General rule of thumb is outflow diameter = twice the diameter of the inflow.

[EDIT]; just saw addy's post; in my case, I was advised to put the slits up. Now, I can see if you get any sort of buildup that flushing might be an issue if the slits are down. That said, there's some here who have done it both ways and it's worked. In my case, I placed large round boulders (8") alongside and one layer overtop of my pipe. Then a layer of 2" round stone. Then the pea gravel. Others use the snorkel and centipede effect (search here if you're interested). So, you probably don't need that wire grate. It may rust out unless it's stainless steel anyway.
 
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