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Thread: New bakki shower

  1. #51
    Tosai
    Join Date
    Feb 2011
    Posts
    46
    Quote Originally Posted by HenryC View Post
    Raymond already pretty much answered the question. The idea behind using wedge wire is to position it on an angle and flow the water down it. Most of the water quickly passes through due to the shape of the wire. Solids are pushed down the incline into a catch bin. If you look at the photo, you will see most of the algae had been pushed into the bin at the bottom of the slope.

    You have to flow water across wedge wire in the correct direction. If I were to put the wedge wire in wrong, the water would not flow through. Note that I used a different type of wedge wire than the Cetus uses. The Cetus uses a sieve bend which is configured to work best when the panel has a gradual bend. I used a sieve panel which is designed to be used completely flat. It works best when the panel is at a 45 degree angle.

    Henry
    Very nicely said Henry. The screen you are using has a much larger open area than the other sieve manufacturers. This is due to the smaller Vee wires used so there are more openings per inch than the large Vee wires used in the other commercial sieves.

    Here is a little tip for periodical cleaning of the sieve screen. Buy yourself a small cheap paintbrush with relatively stiff bristles and wipe horizontally across the screen starting at the top and working your way down. This will help release any small trapped particles from the Vee wires, and the water will help push it down toward the catch basin. Paintbrushes are much easier to use than your hands, and the bristles will go in between the wires and help clean some of the bio build-up on the back of the wires as well. You may still need to remove the screen every month or so and spray it down with the garden hose nozzle to really clean it well.

    Zac

  2. #52
    Tosai
    Join Date
    Feb 2011
    Posts
    46
    Quote Originally Posted by JasPR View Post
    Largest surface space? Not likely! In the 1980s there was a media war waged by manufacturers for the hearts and minds of hobbyists ( and wallets of course! LOLs). The marketing got more and more technical and it was assummed, more and more factual due to the testing and meticulous measuring of surfaces, nooks and crannies. But like most things, the more we isolate study to the micro level, the more we miss the MARO realities of the same!
    In short, it is not the surface area that is ' the thing'---- it is the USABLE surface area!

    Two factors come into play with all media that begin to dramatically change the marketing statistics regarding surface;

    1) is resistance to bioflouling because if a surface becomes closed off to the environment, it is no longer useable surface. This means that pores and poreous surfaces can quickly become clogged and no longer function as aerobic growing surfaces any more.
    2) packing properties- this easy to appreciate reality is based in the question " what happens to a media's surface when an individual piece is placed with other pieces?" In the case of flat, square or rectangular media, the surface is quickly lost when one surface touches another! Therefore a square block might measure as a huge surface but when one block rests upon another, both pieces loose their surface area! This is the reason that so many of the plastic medias are round, spherical or have internal surfaces molded into them.

    In the end, it's not so much about the material as it is about the surface area, packing properties and void spacing. JR


    That is a very good point JR that most people forget to think about when it comes to non-porous media types. Every point in which a piece of media is touching another is then rendered useless in the total surface area count, because the water then has to find a way around that contact point.

    However the type of media that Norm was referencing is a porous biological media (like jap mat) in which the water passes through the media instead of around it (like K1 and other plastic medias). So even though the multiple pieces are touching each other the water is still allowed to travel through the media utilizing all of the available surface area. If two pieces of jap mat were laying on top of each other the water would still flow through the mats, and that is the same with the Cermedia product. The internal pore structure is such that water flows through it very easily. Here is a video that illustrates my point...
    YouTube - Feather Rock VS Lava Rock VS Cermedia ( I apologize if video linking is not allowed )

    Getting back to your usable surface area comment...We can really split hairs here as to what has the highest surface area per volume of space, but it is very important to remember how usable that surface area is. Activated carbon would seem to have one of the highest surface areas of filter media, because of the internal pore structure, but the pores are so tiny that they will be completely shut off once biological bacteria has colonized. The same with some of the other ceramic filter medias on the market. The internal pores are just too small for water to flow through once bacteria has colonized. The ceramic that Norm referenced is very different, in that the internal pores are very large so even with bacterial colonization the water can still flow through it, even if the pieces of media are touching.

    This is not however some kind of "Miracle Media", that can be used in all situations. It has to have really good pre-filtration before it to filter out the large particles in the water, but if used correctly is an excellent substrate for biological filtration.

    Sorry Henry for steering this thread off topic!

    Zac

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