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  1. #1
    Senior Member Rank = Yonsai farmergoggin's Avatar
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    Filter media micron

    Hi everyone

    I know we can buy mesh and filter bags/socks to a particular micron size but does such a thing exist for filter media? Also is it true the human eye can’t see anything below 50 microns?

    Filter wool Ive head filters down to 10 microns?
    Jap matting ?
    K1 micro media ?
    K1 media ?
    Brushes ?



  2. #2
    to answer your second question - a very good human eye can see a particle of about 40 microns . However that doesn't mean you can't see smaller particles. As an analogy just think about fog, you can see that quite easily but you don't see any of the individual water droplets. So if your water is full of sub 40 micron particles I'm sure you'd see them, there would certainly be a loss of clarity.

  3. #3
    Extreme Koi Member Rank = Adult Champion NickK-UK's Avatar
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    You can get stainless steel sheeting down to a few micron. However the open area for the water to pass also reduces very quickly. It's a bit like an oil filter in the car as the pressure rises to get the water flow through..

    I looked at the idea of a "polishing" filter with 10-20 micron stainless steel screen meshes. The mesh needs to have a large surface area and some form of cleaning - which is like a sieve or a drum.

  4. #4
    @ farmergoggin


    Bacterial biofilm (and sometimes also limescale) can partially clog the pores of fine mesh even further, even when it's flushed of general solid particles frequently.

    That's why some people choose to flush their drum filter screens using chlorinated water, for example, as it inhibits biofilm growth.

    Even if you have good intentions to filter more particles out of your pond, I would advise you to avoid using finer filtration unless and until you are able to ensure it is flushed several times per day. The more particles you trap, the more clogging is likely to occur and the more flushing will be necessary. It's the age old problem of mechanical filtration of koi ponds, unfortunately, and it's the reason why RDFs (drum filters) have become so popular for people who are able to stretch their budget to afford one. RDFs automatically flush themselves clean multiple times a day.

    A parabolic sieve is a fairly effective compromise, but they're still a few hundred quid. They are a reasonable compromise because they go down to about 200 microns (give or take), but their design ensures that the water flow nudges any trapped solids, on the filter mesh, just out of the way of the main flow of water.

    Perhaps you already know that the Evolution Aqua Nexus filters trap solids, with moderate success, by allowing a dirt cake to form within the spaces of a static bed of K1 / K1 micro. The cheaper (but still overpriced) Eazypod is a more basic option working on similar principles. The static bed of plastic media is periodically agitated in order to flush the trapped solids away to waste.
    Last edited by MustBeSomethingInTheWater; 26-05-2020 at 11:11 PM.

 

 

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