Filtering strategy

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Oughtsix

Redtail Catfish
MFK Member
Apr 9, 2011
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Redmond, OR
I am starting to design my 29 gallon sump build (Thank you Petco!) and I am trying to figure out my goals for the filter. It seems like the goal of any filter system should be to provide the cleanest, clearest water possible for the Aquarium inhabitants?

For the best water quality it seems like I would want to remove any waste and debris from the water system as soon as possible? If I can remove the waste before it breaks down I won't have to worry about the byproducts of that waste (Nitrates).

I have been tempted to go down the road of bigger is better when it comes to filtering but this doesn't necessarily achieve my goal of the cleanest water possible. It almost has the opposite effect by storing as much waste as possible before I have to clean the filter and hence maximizing the amount of Nitrates that need to be dealt with.

This line of thought has led me to examine an approach of "the more often I clean any filter the better the water quality will be". This brings me to the conclusion that the easier a filter is to clean, the more often it will be cleaned resulting in better aquarium water quality.

After a lot of surfing I came across this design that looks pretty brilliant to me:

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A Cetus sieve designed for a pond. The water flows over the curved screen which filters out large particles. The most recently filtered particles push the older particles down the curved screen and out of the water flow removing them from the water stream. Since the particles are out of the water stream they no longer break down and no longer add to the Nitrates in the tank. This effectively creates a continuously self cleaning filter. Every week or few weeks just scoop out the waste.

I am tempted to mimic this design on my sump. http://www.mcmaster.com/#mesh-filters/=d2r79a has many mesh screen available to choose from.

I am thinking of following the sieve with a series of easy to remove filter bags. I am almost thinking of doing away with any conventional microbe bio filtration and instead relying on a tray of terrestrial plants.

Would anyone like to help me with the engineering to bring this idea to fruition? Or am I just off my rocker???? :screwy:

C440medium.jpg
 
sounds good but theres nothing you can do to avoid water changes. you can prolong it, but youre also assuming all waste goes into the filter. Gravel needs to be vacced. Id like to see pics of the finished product though. go for it man.
 
I accept the concept that there is no way to avoid water changes... but that won't keep me from fighting this reality!:nilly: Good point about waste that doesn't make it to the filter. My tank is a 110gal currently with a half dozen Cichlids. I have been thinking of a continuous water change system... but trying to minimize water consumption.

I plan on building my sump at the same time I am building a new stand. I am having a hard time envisioning enough height under the stand to fit a sieve on top of filter socks and still have easy access to the socks. Ideally the socks would be above the water line of the sump... but this makes for a very high stand!

Hmmm....

Any thoughts? Any flaws in my reasoning?
 
The Cetus sieve specs say the filter screen is a 300 micron perforated stainless steel sheet.

This seems like it would be perfect: http://www.mcmaster.com/#mesh-filters/=d2rr7e except for the $189.62 price tag. GULP!

I am kind of thinking of this PTFE screen for $6.72 a square foot: http://www.mcmaster.com/#mesh-filters/=d2rsf8 with 635µm X 137µm parallelogram openings.
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PTFE (=teflon right?) seems like it might have a low enough surface friction to make the waste particle movement work??? In my experence stainless steel is rust resistant but not rust proof giving plastic some appeal.

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If you live in a dry region, you could try make some sort of system where some tank water will overflow into a sump, evaporate into a catcher, and have the pretty-much-pure water drip back into your main tank, leaving sludge in the sump which you can toss out...
 
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the other thing to think about is the % of waste that actually gets sucked up by ur filtration? i have noticed that most of my fishes crap stays on the bottom with my sump even though i have good current it all gets pushed to an area of still water and accumulates there so i am going to be putting a false bottom in my tank. my plan is to use a powerhead to push all the crap to the sides of the tank where there will be holes that will allow the crap to fall below. i have two bulk heads on the bottom of the tank that are connected to a gate valve that allow for a hose to be attached. my hope is that every day i will be able to clear out most all the crap in the tank by opening up the gate valves. water in the tank will be forced to go below the false by from the edges pushing/pull all the crap out of the tank with draining just a few gallons of water.
 
Hmm... Long-dead thread, but has anyone gone through with the build?

Looking at doing something similar, but unsure of how much surface area I need for what size of mesh given a flow of 1800gph.

If anyone reads this, I would appreciate any and all input.

AZR
 
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You tube it. Many builds there.
 
20160804_172012.jpg
The tube next to the overflow, picks up the heavy poop.
I have super fine sand 1/4" thick substrate.
So nothing sinks in very well. Water flow pushes waste into the corner. Air lift pulls it out of the tank.1467765704437.jpg
The over flow dumps into the sluice box, we're the filter floss, and micron screen removes waste out from the flow of water.
It gets cleaned daily.
40 African cichlids in a 75 gallon.
Nitrates float around 15 ppm 20ppm
Wet/dry bio 500 gph flow
86 square inches Led powered algae scrubbers.
155 gallons of system water.
 
Is that 86 sq. in. of lighting, of scrubbers, or filter surface?

How many microns is your screen? Although you clean it daily, does it seem necessary, or is it just part of your routine? Although I do maintain my systems to at least some extent daily, I don't know with my schedule if I have the time to clean the filter daily.
 
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