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.damian said:oops, that was a crosspost.
eta i will take your word for it, since yours works!
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 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 .
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..damian said:the pond will be 6000 gallons, and i'm targeting recyling once per hour.
As long as the waterfall weir is lower than the exit pipe from the doc filter, it will flow, it has to.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.
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 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.
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.damian said:Fluid dynamics are not that simplistic.
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 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.
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