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#498808 - 11/17/18 12:52 PM How Many Aerators do we Need?
TucknDucks Offline


Registered: 10/21/18
Posts: 6
Loc: Nebraska
We have a 3.6 acre sand pit that is 9' deep on one end with most of the lake (80%) 6 feet deep. How many and how large of aerators do we need. Thanks

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#498813 - 11/17/18 02:38 PM Re: How Many Aerators do we Need? [Re: TucknDucks]
Bill Cody Offline
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Lunker

Registered: 04/18/02
Posts: 12550
Loc: Northwest Ohio - Malinta OH
In my opinion at a bare minimum you will need 1 diffuser per acre when the system is run 24/7 during water temps above 50F, so in your case I would say four diffusers. Each diffuser could be a dual or triple head unit. If you want to run the system 10-12 hrs per day and get a good water turnover per day, I think 7-9 diffusers would be best and operated by a 3/4hp compressor or two smaller 1/4-1/3hp units. Each single diffuser(1head) based on its size requires a minimum amount of air volume to operate it efficiently, often 1cfm.

Water body shape also plays a big role in how many diffusers are needed. The more round the pond the fewer diffusers that are needed from the minimum.


Edited by Bill Cody (11/17/18 02:46 PM)
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#498822 - 11/18/18 12:39 AM Re: How Many Aerators do we Need? [Re: TucknDucks]
TucknDucks Offline


Registered: 10/21/18
Posts: 6
Loc: Nebraska
I am very new to the aerator topic. So I have more questions.

The pond is basically rectangular in shape.

How does a person decide to run the unit all day or 1/2 day?

How many aerators can run on unit?


I don't have electricity to the edge of the pond, but I do have a barn with electricity about 80 yards away. Could I keep the pump at the barn and just pump air that far or is that too far to push it?


Is there a website or link to previous discussion or pond boss magazine article that describes how to determine when you aerate based on geographic location and time of year ect? Prior to becoming a PondBoss fan I though the purpose was to just add extra dissolved O2. I had no idea the it would help move water and also help break down the organic sludge at the base of the pond.

Thanks for the replies in advance.

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#498844 - 11/19/18 08:43 AM Re: How Many Aerators do we Need? [Re: TucknDucks]
Quarter Acre Offline


Registered: 06/10/16
Posts: 857
Loc: West Central Missouri
I have only got one year of aeration experience under my belt, but my deciding factors on the hours that I run the systems is based on outdoor air temps and water temps. Being in Missouri and only having a 1/4 acre pond, I worry about over heating the pond water in the heat of the summer. So, I take temperature reading at 18" down and at 7 foot down and compare to the outside air temps. It's a bit tricky when the air and water temps are in the 80's, meaning that about 85 water temp is what I consider borderline too hot. I will gradually start the air up in the spring to 24 hours a day until the water temps get to the mid to upper 80's then start cutting it back to only run at night so that it reduces the amount of heat transfer during the day. Once fall hits, I start adding aeration back to the day time hours when the outside temps drop below 85. This period is a very short, it seems like fall comes in pretty fast and may not be yielding much benefit. Then as mid fall comes in, I reverse the thought pattern and try to maintain warmer water by reducing nighttime aeration. This can happen pretty fast too and benefits are questionable as well.

Note: the heating effect comes from the moving of the water to the surface where it can become more exposed to the sunlight/hot air temps (or cool night air depending on the season). More movement equals more heat transfer regardless of whether we are considering heating or cooling of the pond.

The reason I really question the benefits with the above concept during season transitions is because changing the aeration time schedules certainly affects the fish's feeding habits and their willingness to be caught on rod and reel. I ask myself if the fish would be better off with one fall time aeration change (like band-aid removal) compared to 2 or 3 gradual adjustments over the the coarse of the month?

Being in Nebraska, I suspect 24/7 summertime aeration may be what is called for and spring and fall transitions could likely be more abrupt compared to Missouri.

I have read that running air lines under ground is a good alternative compared to running electricity, but I have also read about condensation in the lines being a problem if the lines are not run with proper grading so that water condensation buildup can be avoided...frozen lines are not good.
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#498848 - 11/19/18 05:05 PM Re: How Many Aerators do we Need? [Re: TucknDucks]
Bill Cody Offline
Moderator
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Field Correspondent

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Registered: 04/18/02
Posts: 12550
Loc: Northwest Ohio - Malinta OH
Aeration companies suggest 24/7 operation as a default guideline to cover as many pond situations as possible. Aeration run times is a complicated topic due to the wide variability in ponds and type of aeration systems available from homemade to commercial units.

IMO running the aerator 24/7 causes more ware and tare on the compressor, more frequent maintenance / pump rebuilds, and compressors need to be replaced more frequently due to motor bearing failure.

Unless the aerator is too much or way over-sized you generally cannot over aerate a pond unless the air temps are in the high 90-100F. Then this makes the pond too warm and can harm numerous fish species including bass and BG. Amount of harm from excess water temps depends of several factors. Exceptionally strong circulation currents can re-suspend micro-clay sediments and keep the pond turbid to varying degrees. I have seen neutrally buoyant leaves moving in current from strong bottom aeration.

The general rule is to turn over the pond's entire water body a minimum of once a day. Many aerator companies will size the aerator to do that guideline. If you slightly or moderately over-size the aeration system then when you think, calculate, or measure the pond has been turned over at least once or twice in that day, then the aerator can be stopped until the next day. Generally for smaller ponds I try to over size the aerator so daily aeration is generally 2-8hrs.

I will look for a recent thread discussion in Aeration System questions where this topic was discussed at length. I found this one of several past threads that discuss aeration run times. NOTE - This thread does not discus and go into detail about water lifting volumes of diffusers. There is a past thread where that was discussed. Water lift rates of diffusers and the amount of air volume they receive determines how fast a pond will be turned over. There is about only one aeration company (Vertex) that has measured water lifting rates of their diffusers. All other companies with aeration diffusers are guessing or do not know lifting volumes.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=454091#Post454091

Here is a thread this discusses lift rates. It gives a link to lift rates of Vertex diffusers. I found it by using google and typing: pond boss forum aeration water lift rates volume
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=492657

Here is a bunch of reading homework about topics of pond aeration:
Diffuser location and Turnovers
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=489945

How much is too much
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=496311

Sizing for one acre
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=383205

How many diffusers for 2.25ac?
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=252644

Small pond system sizing discussion
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=252644

Diffuser zone of influence
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=461601

Aerator run times and sizing - TX
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=444639

Water flow at the surface calculation formula
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=31894

Diffuser selection
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=30911

Aeration and influence on water temperature
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=30911






Edited by Bill Cody (11/19/18 05:47 PM)
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#498850 - 11/19/18 06:38 PM Re: How Many Aerators do we Need? [Re: TucknDucks]
wbuffetjr Offline


Registered: 08/16/14
Posts: 884
Loc: in the mountains
Tucknducks - Not all that long ago I was sitting right where you are. I am still no expert, but I do understand the basics. Mr. Cody just hooked you up. There is a TON of knowledge in that post he just made. Should help you answer a lot of questions. For me, I just jumped in and started reading everything I could and it slowly started to make sense.

Of course, I still look at my water and all the time wonder WTH is going on! Lol
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#498851 - 11/19/18 06:46 PM Re: How Many Aerators do we Need? [Re: TucknDucks]
wbuffetjr Offline


Registered: 08/16/14
Posts: 884
Loc: in the mountains
I will add one more thing that is VERY important to the aeration equation. BUDGET.

A lot of the time it seems folks' budgets determine the size of the system versus what the optimal setup would be. Sinking line isn't cheap, quality diffusers/bases aren't cheap and a pump to run several diffusers isn't cheap either. I still don't like to think about how much I have sunk into pumps and sinking line.
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