Sticky Doc Bio Filter


koiguy1969

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most of us average 1000 - 1200 gph flow thru each 55 gal barrel. 3 minutes is adequate for a decent biological hangtime... and the more flow the longer particles stay in suspension.working their way up into the biological media. 1000 - 1200 gph is a happy medium, it allows over 3 minutes in filtration and the flow is light enough to allow for a good settling of debris in the filters sump area. using a larger diameter pipe to plumb your filter aids in this as well.allowing more flow , but under less pressure, so debris can settle faster, before reaching the media. i use 1&1/2" pipe to plumb mine.
 
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Resurrecting an old sticky.......would adding a venturi at the top elbow going into the doc barrel be beneficial or would the added air just stir up the settling part of the barrel? I am in the process of making 2 identical Doc Barrel filters that will drain into a trickle tower (tote actually) and then back to the pond, and I am thinking about adding the venturi"s to the top supply pipes for the barrels.......mostly because I think it is cool :afro: , and oxygenated water is good for the pond. But I don't want to add them if the air bubbles are going to pull up the heavy particles I am trying to keep in the bottom of the barrels. Any one have any practical experience with this?
 
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DrDave

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Great question!
You bring up a good point, with the air bubbles rising, they could carry the heavier particles that you want trapped in the vortex at the bottom. My Doc Bio Filter feeds a cascading waterfall which adds oxygen to the water during the 10 foot cascade over rocks. You could try it. Catch water in a tall glass then let it settle. Do this both ways, with the aerator on then off. I think that would allow you to perform a good test and make an informed decision. Let us know what you find.
 
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I will add the venturi's and see if it is different with it on or off (it is a new pond so it will be a while before I can get a valid test). Thanks.
 
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Dr Dave if I use plastic fence should I cut it up into pieces or just put a loose roll(s) into my tank? With a 200 gallon tank how much 36" high fencing should I use? My tank is 38" in diameter and 30 inches long.
 

DrDave

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I just rolled mine up. It is the surface area that matters and believe me, a bunch of pieces can be a problem, especially it they get into the ball valve.
 
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Thanks Dr Dave, how many gallons is in your pond and how fencing much did you use? Do you think it would matter if there was a lot of "just water" around in other words if I rolled up a some sections but they just floated around the tank would that be a problem? Here is what the tank looks like.
[sharedmedia=core:attachments:56582]
 
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Yes but you were using a barrel with my set up I can't wrap it around the sides like yours. I could roll it loosely and shove it in length wise. The tank is 38" in diameter and 30 inches long. The pond is 3000 gallons or so. It looks like you used 50 feet but I'm not sure how many gallons that would take care of.
 

DrDave

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If I was using this container, I would add as much rolled fencing as will fit into the opening making sure it is not too tight. Water has to be able to flow through it so the bacteria can feed on the nitrites. This is not rocket science, it also has to do with fish load and the pond size has little to do with that.
 

HTH

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@mgmine every surface in the pond grows biobugs. With the right balance of fish and surfaces you would not need a bio filter. Just a matter of stocking levels.

I picked up some snow fence a couple of weeks ago. It was out of season so the gal at Home Depot found it in storage someplace. It looks like there is a bit more surface with it. It is a lot easier then chopping PVC pipe into bits. I first seen it maybe 20 years ago on a koi pond.
 
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Sorry to bring up an old thread but I need some advise from DrDave. I built this filter a couple years ago and it has worked great. I used cut pvc pipe for my media because I had it on hand at the time. I had to pull the pvc for some deep cleaning and I don't want to go back with it. I went to your web site and the filter article appears to be gone. The main thing I wanted to check was the stand height inside the drum. Does it need to be changed for the poultry fence or should it be the same as the original with pvc pipe?
 

DrDave

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Unfortunately my web sites are being shut down due to Tripods greed. Every free site I had was over their new maximum pages and they won't allow me to update them.
The good news is, you don't have to change the height to go to the plastic fencing material. I hope to find another free web publishing site to put everything back up again. Tripod is NFG...
 
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