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Bill D. #483759 12/05/17 11:55 AM
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Gives us just one more reason to hope for rain! smile

Last edited by Bill D.; 12/05/17 03:26 PM.

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One of the things folks are concerned about when aerating during the winter is super chilling the water. I only aerate during the winter when we have snow cover or thick opaque ice and then I still try to do it only on "warm" days. In the spirit of Mutt Pond, I decided I would try something a little different this year in an effort to mitigate the potential for super chilling the water. Just thought I would share the experience in case others can benefit.

Our winter diffuser is in 3 to 4 feet of water now as the pond is roughly 3 feet below full pool. It is located such that it's in the path where water from the well enters the pond. My idea is to add the "warm" (50 F 35 gpm) well water while running the diffuser. The goal is to minimize the drop in temperature of the pond, in the absence of the insulating ice layer, while the pond surface water is exposed to the frigid air during aeration. We had a one day heat wave today (got to 14) so I gave it a try before the temps drop back to below zero. Although I did not measure water temps, I can report that the hole opened by the diffuser was significantly larger than in the past and, as the water rose from the well input, it came out on top of the ice and cleared a much larger area of snow.

My concern is that I'm adding essentially zero DO water from the well which seems counterproductive to the goal of winter aeration but hopefully as the water enters over a 4 cfm diffuser that is insignificant.

Last edited by Bill D.; 12/29/17 07:44 PM.

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Is there a way, perhaps with a venturi in line, you could introduce air into the well water flow into the pond?

A small air tube introducing air bubbles into the water flow at the point of the venturi. The venturi drawing air into the water line much like a small engine carburetor draws gasoline into the air flow at the point of the venturi at the carburetor???

Or, lacking a venturi mechanism, installing a "T" in the water line after the pump and introducing air with another aeration pump or diverting some air from your existing air pump.

Last edited by snrub; 12/30/17 07:02 AM.

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I agree with snrub when it comes to adding a venturi air system into your water line. A 3 or 4" long peace of pipe with a qtr inch ID can be inserted into the water line at a 90 degree angle will add air to the water. Adjust the small pipe until you feel a suction with your finger tip. I have mine set up about 10 feet from the end of the water line. I can see the difference in the water stream when comparing with or without the small pipe. I also have some 12" rocks that the water hits and causes water to splash into the pond. Bill, I am sure (based on my reading your post for the last 3 yrs or so) you can do this smile


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I like the venturi idea guys! Problem would be incorporating it into the existing setup. Not saying it can't be done but would not be a quick/easy project. The line from the well is buried 42 inches deep (below the frost line) and enters the pond under water; currently about 3 feet down. We are near low pool so the water will rise 3 or 4 feet more at full pool. As John suggested, another option would be to inject air before the line leaves the basement but the line pressure is 70 psig at that point so I would need an oil free compressor capable of higher pressure.

The question remains...is what I'm doing now by passing the well flow thru the diffuser "good enough" or is it causing a problem with low DO? Another question is, and probably more relevant, am I really gaining anything at all as far as mitigating super chilling by using the well water to "warm" the pond water locally during aeration? Thoughts?

Last edited by Bill D.; 12/30/17 07:21 PM.

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Gallons per inch verses GPM. It would take a lot of water to effect water temps, I would think. More likely to effect DO first, Don't u think?


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Thanks for the input Tracy!

I think you're probably right. In 6 hours I add 12000+ gallons of well water which is a tiny percentage of the pond capacity. It probably has insignificant impact on either temp or DO. The one thing it does do for sure is raises the water level just enough (benefit of a small pond) to get water out on top of the ice more and clear a larger area of snow than that provided by aeration alone. I don't aerate that often during the winter but I'll go ahead and use the well when I do to see if there are any bad effects.


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I have read several times on the forum that well water has no dissolved oxygen in it. I had the opportunity to visit Gavin's Point national fish hatchery in South Dakota last summer and noticed something that made me wonder if some well water may have significant amounts of DO. They had a run that was about three feet wide and 50 feet long with Rainbow trout in it. At one end there was a pipe pumping water into the run at high volume. It was sub surface and no turbulence on the surface or airation was going on. I asked the fisheries biologist where the water was coming from and he said it was well water and had not been processed or airated.

If you Google DO in well water, there are several publications discussing the issue, and it sounds like there can be significant DO in well water depending on the well.

Just wondering if a person could measure the DO in the well water to see if it needed airation prior to being pumped into a pond?

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Originally Posted By: DrWizz

Just wondering if a person could measure the DO in the well water to see if it needed airation prior to being pumped into a pond?


You definitely can. You need a portable DO meter, though.

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Originally Posted By: DrWizz
I have read several times on the forum that well water has no dissolved oxygen in it. I had the opportunity to visit Gavin's Point national fish hatchery in South Dakota last summer and noticed something that made me wonder if some well water may have significant amounts of DO. They had a run that was about three feet wide and 50 feet long with Rainbow trout in it. At one end there was a pipe pumping water into the run at high volume. It was sub surface and no turbulence on the surface or airation was going on. I asked the fisheries biologist where the water was coming from and he said it was well water and had not been processed or airated.

If you Google DO in well water, there are several publications discussing the issue, and it sounds like there can be significant DO in well water depending on the well.

Just wondering if a person could measure the DO in the well water to see if it needed airation prior to being pumped into a pond?


Thanks for the input Doc. Very interesting reading on Google.

Does anybody know of a single use DO test kit? Spending a few hundred dollars on a DO meter is not an option for what would be a one time use to check my well.


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I did a little Googling and found that there are DO test kits available at a reasonable price. Anybody used one or have a recommendation?


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There are chemical test kits that are accurate to measure dissolved oxygen depending on how well you collect the sample. The way you collect the sample can diffuse more oxygen into the sample. Here are two good quality DO test kits.

https://pentairaes.com/lamotte-dissolved-oxygen-test-kit.html?msclkid=04b917a4cd621582951e4df43574b54c&utm_source=bing&utm_medium=cpc&utm_campaign=(ROI)%20Pentair%20AES%20-%20Shopping%20-%20Desktop&utm_term=4584826048954002&utm_content=Water%20Quality%20Testing

http://www.lamotte.com/en/aquarium-fish-farming/individual-test-kits/5860-01.html


http://www.forestry-suppliers.com/product_pages/products.php?mi=33281&itemnum=78052&redir=Y

There may be good simple chemical test kits available at good aquarium supply stores. Research testing kits before purchasing them, as some are known to produce flawed results when used in conjunction with other chemicals and water treatments.

I learned and used the standard chemical method in college and later kits that were similar to the chemical method for measuring DO. The name for the chemical method for measuring DO is called the Winkler Method. The Winkler method is/was used as a standard test to check the accuracy of a DO meter.
Full description of the Winkler method.
https://serc.carleton.edu/microbelife/research_methods/environ_sampling/oxygen.html

Last edited by Bill Cody; 01/06/18 10:24 AM.

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Thanks for the info Bill. Sounds like collection and handling of the sample are key to an accurate result. I think I will order a kit and give it a try next summer. I'll report back the results.


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When you bubble water into a bottle it diffuses extra oxygen into the sample. I am not sure how much DO in ppm is added to the water when water is bubbled into the collection jar. Ideally the water is supposed to be collected with a device (Kemmerer or Van Dorn sampler) that underwater it entraps water & a 'messenger' on the rope closes the container. Sampler is then raised to the surface and water is let out the bottom through a tube into the measuring or testing container. Water is filled into the testing container from the bottom to the top and overflowed. The process minimizes water contact with air.

If the sampling bottle is held side wise and water is gently drained into the bottle without bubbling, this should provide decent results.

Last edited by Bill Cody; 01/09/18 06:36 PM.

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Bill D. #486902 03/07/18 06:48 AM
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Originally Posted By: Bill D.
Originally Posted By: Bill D.
Update.... I also installed 4 flashing amber lights today in an effort to annoy them if they sneak back after dark. Jury is out on the results.


Jury is still out on the flashing lights but we no longer wake up to geese on the pond that have sneaked in after dark. Maybe they are working. The lights I bought are solar powered and extremely well constructed. Maybe the cost of 4 lights for $185 delivered was worth it...still getting random geese dropping in during the day though. Must be last years goslings that are too young too nest.


Update on my flashing yellow lights as a geese deterrent. My understanding is the lights are supposed to make the geese think a potential predator is nearby and prevent them from staying at the pond at night.

As dawn was breaking over the pond this morning, I noticed a pair of geese....camped out next to one of the lights!! frown I will give it a few more months but I think this experiment is going to be a failure. I wish the lights were adjustable with respect to intensity and frequency of flash. Maybe that would make a difference????


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Bill D. #487965 03/30/18 06:14 PM
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Another update on the flashing yellow lights....

Since that one occurrence of geese on the pond at day break, no more have spent the night on the pond. Perhaps the lights are working or at least helping.

The lights do nothing of course with respect to geese dropping by during the day. Those leave right away though when my old dog 410 barks at them. grin

Last edited by Bill D.; 03/30/18 06:16 PM.

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Bill D. #487967 03/30/18 06:55 PM
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Well knock me over and call me Bob O!

Almost dark here and a pair of geese dropped into the pond. A few minutes later the flashing yellow light sensors kicked them on. A couple minutes later the geese left!

I'll keep updating this post for a couple more months. Hopefully, folks thinking about investing in flashing yellow lights will benefit from my little experiment. Just as a recap, my 4 lights are solar powered and cost around $40 each.


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Bill D. #487989 03/31/18 09:10 AM
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Excuse me but is that first line meant to imply that I'm horizontal too often?


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Bob-O #487998 03/31/18 01:09 PM
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Originally Posted By: Bob-O
Excuse me but is that first line meant to imply that I'm horizontal too often?


Of course not!

Hadn't seen you posting lately so thought I would just "chum the water" a little to see if you would rise to the bait! grin


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Some suckers will always rise to the bait. Been busy dodgin the Blue hairs down here. They can't resist the camo speedo,


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Glad you back in the game Bob-O

Bill D. #488016 03/31/18 08:37 PM
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Bill D. Nice work rattlin' up the Bob-O. I'd been considering pm-ing you to see if you had any idea where he was sleeping.

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Hell 4 corners, most the time I don't know where I'm sleepin or where I'm at when I wake up.


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Glad you're back Bob-O.

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Fear and loathing in NE IN and central FL.


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