Sticky Doc Bio Filter

A

Advertising

koidaddy

karps house of koi
Joined
Jan 31, 2010
Messages
765
Reaction score
12
Location
Tampa Bay Florida
Do you have a pic of the weir? How wide is the opening? As long as the flow from the weir into the pond is greater then the flow from the filter to the weir it should work. Probably twice the size outlet on the weir .
 
A

Advertising

koidaddy

karps house of koi
Joined
Jan 31, 2010
Messages
765
Reaction score
12
Location
Tampa Bay Florida
damian said:
oops, that was a crosspost.

eta i will take your word for it, since yours works!
How much water will you be pumping? With my current setup(those two and a third) I could probable have them sit even height. The extra barrel slowed down flow through the mech/bio setup.
 
Joined
Jun 7, 2011
Messages
138
Reaction score
1
Location
Rochester Hills, MI
koidaddy said:
Do you have a pic of the weir? How wide is the opening? As long as the flow from the weir into the pond is greater then the flow from the filter to the weir it should work. Probably twice the size outlet on the weir .
i don't have the weir yet. i wanted to nail the science down before i picked one because i noticed they have the bottom inlet, and for some reason i always thought you dumped into them from the top.
 

koidaddy

karps house of koi
Joined
Jan 31, 2010
Messages
765
Reaction score
12
Location
Tampa Bay Florida
damian said:
the pond will be 6000 gallons, and i'm targeting recyling once per hour.
Ok, at 6000 gallons an hour your might have an issue. I am pumping @3500 gallons through mine. Worse case is you install a ball valve into the filter line that you can controll the flow into the filter and tee off the excess into a spray bay or other water feature..
 

DrDave

Innovator
Moderator
Joined
Aug 29, 2007
Messages
6,836
Reaction score
87
Location
Fallbrook, Ca USA
damian said:
i've included a competely awesome picture i drew to demonstrate my concern.

it seems like with the inlet at the bottom like this, the weight of the water in the weir as it fills would prevent additional water from being received. i.e. the water exiting the doc filter would be fighting against the pressure of the water in the weir and instead overflow the doc filter.

As long as the waterfall weir is lower than the exit pipe from the doc filter, it will flow, it has to.
Gravity 101
 
Joined
Sep 5, 2009
Messages
246
Reaction score
0
Location
Dallas/Fort Worth area
DrDave said:
Just one roll, cut in two so it was twice as long, half as wide. I laid them on top of each other and rolled them back up. It does not sit in the 55 gallon drum very concentric, but it does not have to for the aerobic bacteria to do it's job.
Nice. It is SO easy to build one of these filters. Thanks for doing the research and making things easy for the rest of us. It is much appreciated. Makes me wonder though... think something like this could ever be used for sewage?
 

DrDave

Innovator
Moderator
Joined
Aug 29, 2007
Messages
6,836
Reaction score
87
Location
Fallbrook, Ca USA
damian said:
Fluid dynamics are not that simplistic.
Fluid dynamics offers a systematic structure that underlies these practical disciplines, that embraces empirical and semi-empirical laws derived from flow measurement and used to solve practical problems. The solution to a fluid dynamics problem typically involves calculating various properties of the fluid, such as velocity, pressure, density, and temperature, as functions of space and time.

Very little of this applies. Gravity prevails unless you are introducing a resistance in the waterfall weir, such as sub filters (which are not necessary). If the weir overflow is lower than the bio filter overflow, water will flow.
 
Joined
Jun 7, 2011
Messages
138
Reaction score
1
Location
Rochester Hills, MI
maybe fluid mechanics is a better term. what i'm thinking about specifically is hydrostatic pressure, which is a term i forgot about until someone else pointed it out to me a few minutes ago.
 

ZmanArt007

Fish Keeper and Filmmaker
Joined
Jun 21, 2009
Messages
514
Reaction score
234
Location
Northeast Nebraska
Hardiness Zone
5a
Country
I believe Doc Dave is correct, but if you are that worked about it, just make the outlet of the doc filter even, or even above the top of the wier. You shud have no problems at all then.
 
Joined
Jun 7, 2011
Messages
138
Reaction score
1
Location
Rochester Hills, MI
ZmanArt007 said:
I believe Doc Dave is correct, but if you are that worked about it, just make the outlet of the doc filter even, or even above the top of the wier. You shud have no problems at all then.
basically it turned out to be a hydrostatic pressure question after i looked around a bit, so now it makes sense. the pressure exerted by a vertical column of water is a function of its height, and once it starts going even just slightly, it creates a siphon effect that continues to pull the remainder.
 

ZmanArt007

Fish Keeper and Filmmaker
Joined
Jun 21, 2009
Messages
514
Reaction score
234
Location
Northeast Nebraska
Hardiness Zone
5a
Country
Right...
Well I offered my opinion on the question, so now I think I'm done with the topic, and I don't want to get in an arguement.
 
A

Advertising

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Top