Nexus Filter Build

kendragon

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Have a look at koiphen forum if you haven't already. Several members there have done what you intend to do.

At the heart of the nexus is a static bed for easy clean mechanical followed by a moving bed of K1. A lot of people (including myself) use 2 separate barrels to accomplish the same thing.
Outstanding thread; very interesting! Looking forward to updates.

The cheapskate DIY-er in me is now wondering how I can build one of these out of Rubbermaid bins and garbage cans...:)

How is the mechanical media cleaned? I see the waste valve to drain sediment, but the actual media must become steadily more and more clogged as time passes. Is that inner chamber easily removed and just pressure-washed to clean, or does the media need to be removed and washed separately?
Thanks for input Fellas.
The conversion that I'm doing is not unique. It is a kit that Nexus put out as a product improvement for their Model 310 with full instructions.
People have complained that the center mechanical chamber is too close to the bottom making it difficult to wash. They've raised stainless steel chamber off the bottom allowing full access underneath and introduced K1 micro to trap more particles.

This looks like a very easy filter to maintain. That and applying this to fish other than Koi is my main goal.
 

kendragon

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NEXUS 310 INNER MECHANICAL CHAMBER

Stainless steel chamber has no bottom and is bolted to the bottom of the vortex settling chamber.
DSC_1770.jpg

Half the waste disposal hole is obstructed and waste is trapped inside the mechanical chamber.
DSC_1762.jpg

DSC_1765.jpg
 

kendragon

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NEXUS 310 vs NEXUS 320 MECHANICAL CHAMBER
When installed the top will be at the same level as the original. You can see how much shorter the 320 is which pulls it off the bottom of the settling chamber.

310 on the left.............. 320 on the right

310 has no bottom........320 has a stainless steel bottom

310 has K1 media..........320 has K1 MICRO media


DSC_1775.jpg
 
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Rass

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My lord. This makes me want an indoor pond setup for large cichlids even more now lol!
 

kendragon

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Too hot, too tired, too lazy, too old.....when I was younger, I can knock this out in one day.....not anymore.
Going to go with this 1/4 hp I got laying around. Very low amp. A little too much flow for this filter but we'll see.
Got the 4" returned done. Hope to have the rest of the plumbing done tomorrow.
Neighbor's going to love the view of my filter.

DSC_1780.jpg
DSC_1783.jpg
 
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kendragon

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All hooked up.
DSC_1790.jpg
DSC_1784.jpg

After conversion to model 320 the settling chamber and drain is completely clear for easy cleaning.
DSC_1793.jpg

Clean water return grille
DSC_1796.jpg

DSC_1797.jpg

Bypass pipe in the event of mechanical filter is clogged.
DSC_1799.jpg
 

kendragon

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Everything went well on the startup.
Water is pumped from the pond into the filter then gravity return back.
Media needs time to soak. Lots of air in the K1 micro. Hope it seeds fast.

 

kendragon

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I incorporated a 3" diameter stand pipe for the return. This appears to be a good match for the pump flow rate. No gurgling or sucking of air.
Water level is still trying to stabilize so you can hear a few burps in the video. I'm going to make adjustment and fine tune it in the following weeks as it matures.

 

kendragon

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Nexus 320 is rated for a 9000 gal pond.
4" diameter return pipe. Check my flow.

 
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