My DIY Rotary Drum Filter (RDF).
  • AlvinAlvin July 2012
    Posts: 84
    Hi,

    Managed to finish my RDF early last week. Some photo during the making of RDF. i am using a 30 micron filter mesh and the final result :) (Y) ....very happy with the water clarity. Have to say goodbye to weekly manual cleaning [-( .Took me 3 month to make this with help from my good friend.

    This is just to replace my mechanical filtration and i still have my biological filter. Flow is at ~ 15,000 liter perhour (Can't confirm as i don't have a flow meter but visually seem like 15K).

    Just to share it with you guys.
    koianswers.com/discussion/download/8488/photo 1a.JPG
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    Post edited by Alvin at 2012-07-30 02:16:21 pm
  • mangkellmangkell July 2012
    Posts: 1,221
    Bro Alvin,

    Pls explain how your DIY RDF works... :/

    Any different to the standard RDF?

    It will be beneficial to all newbie like me... Tq
    Mickeyko Ducati-Kujamon Chagreemon Brabus#Sexy-Robust
  • BthineshkumarBthineshkumar July 2012
    Posts: 1,763
    Bro Alvin,

    How much does it cost??
  • harry_luhurharry_luhur July 2012
    Posts: 808
    Nicely built bro Alvin. Good Job.
    Regards,

    Harry Luhur
  • kwchankwchan July 2012
    Posts: 131
    Hi bro, kindly please PM me the price you make this thing too. If possible do you mind me to drop by your place to see how this thing work? Thanks.
  • MikeMike July 2012
    Posts: 346
    Damn, this a DIY job ??? Looks more like a pro custom work. (Y)
  • AlvinAlvin July 2012
    Posts: 84
    i have attached link from youtube on how RDF Works. Bro Mangkell, very hard for me to put it in word on how the system work. hope this link help.




    Bro Bthineshkumar, i didn't really calculate the cost yet but definately cheaper than manufacturer. i over spec the system for easy modification and program design flexibility.

    Bro Kwchan, you are welcome to view the unit function. located in shah alam, section 32. Pls call 012-6832628.

    Bro harry, thanks. Dump in a lot of time in the design but happy with the overall result.

    Bro Mike, my nature of work is in machinery design and electrical control system. So DIY is pro custom work loh.. :-D :-D
  • grinkz01grinkz01 July 2012
    Posts: 530
    bro alvin...congratz to ur diy rdf...for the control unit, did i see:
    - variable speed drive?
    - micro PLC?
    - HMI unit?
    if yes it must be expensive control unit (i believe will cost u > RM 2000)?

    also would like to understand whether ur rdf is pressurized (clean water flows from inside to outside of the drum) or vacuum one(clwan water flows outside to inside of the drum)?

    thx
  • pandaipandai July 2012
    Posts: 1,083
    Bro Alvin / Bro Harry,

    Do you know is there is a supplier for RDF in Malaysia (either by Koi Collection or any other manufacturer)? How much are they selling it for a similar unit to KC10, KC30 or KC60?

    Thanks.
    Get Kenkona Koi and Kenkona Bio at special price online at http://kenkonakoi.blogspot.com/
  • AlvinAlvin July 2012
    Posts: 84
    Bro Grinkz01,
    definately more than 2K. i put all this in to make just to have easy setting and monitoring.
    -Variable speed = i don't know the required speed, so install a variable speed controller.
    -Micro PLC = well, just for easy modification and using to control other thing as well other than RDF. (Pump, UV and etc)
    -HMI - This is just for user friendly setting of timer and display function history. more for monitoring of the system and alarm.
    **All above is not necessary for RDF, just an add option for easy control. Most of the commercial RDF unit doesn't have this installed in their control system.

    Dirty pond water will go into (Inside) the filter drum and filtered water flow toward outside of the filter drum. (Gravity flow and not pressurized). The dirt will flow out from inside drum through a sludge tray to drain (by using pressurized spray nozzle).

    Bro pandai,
    Mr Luke from Sentul Park Koi Centre is selling KC Series RDF.
    Post edited by Alvin at 2012-07-31 10:19:54 am
  • pandaipandai July 2012
    Posts: 1,083
    Thanks, Bro Alvin. I've contacted them. Awaiting reply.
    Get Kenkona Koi and Kenkona Bio at special price online at http://kenkonakoi.blogspot.com/
  • NeliNeli July 2012
    Posts: 1,205
    Alvin, U are a clever man! Job well done!
  • harry_luhurharry_luhur July 2012
    Posts: 808
    Bro Pandai,
    There are so many RDF manufacture now from small scale to industrial grade. Many china made also
    Available on market. Price a bit expensive, and without proper maintenance, it can createa very small (dust) particles. I had discussion with bro David before regarding this, and this is his opinion. I also install 1 unit in one pond i built, which require low maintenance. And yes, water look great and clean but i have a slightly fog around pond water column. I guess this is one reason sifu David not suing this RDF.

    Bro Alvin,
    You DIY look professional lar. A little suggestion is to put a layer of stainless steel 2x2 or 3x3cm wiremesh around the drum, to hold the screen round nicely.
    Regards,

    Harry Luhur
  • AlvinAlvin July 2012
    Posts: 84
    Just to share some info :

    Some of the negative feedback from RDF user is :
    1) Slime accumulated on the filter mesh
    2) Some fogging/milky on pond water when using Rdf (Usually in deep pond design).
    3) Maintenance issues.

    IMHO all this is solvable :
    1) believe it is due to spray nozzle pressure too low to remove the slime from filter mesh. i oversize the spray pressure to rectify this. hopefully no problem for me.
    2) a lot of commercial RDF doesn't put in fine filter mesh maybe because it will reduce the flow tremendously and high cost. Most of it in the market is at 100 micron to lowest 40 micron rating (Exclude china made). lower Micron rating will determine the water clarity and prevent water fogging issues. i did not have this issues on 30 micron filter mesh.
    3) Most RDf in the market are built to last for at least 2-3 years before requiring minor maintenance.

    Bro Harry,
    My initially design is to put in 15 micron filter mesh but decided to try out 30 micron first. 15 micron price is too expensive. if all goes well on 30 micron filter, i will try to install 15 micron to see its effect later.
    Point noted on the wiremesh, would do that during replacement of 15 micron filter mesh :-D



  • pandaipandai August 2012
    Posts: 1,083
    Bro Alvin,

    Do you plan to mass-produce this and sell to us all?
    Get Kenkona Koi and Kenkona Bio at special price online at http://kenkonakoi.blogspot.com/
  • AlvinAlvin August 2012
    Posts: 84
    Bro Pandai,

    Never really thought of mass production. Hmmm. I Just like to built something to suit my pond need and also the fun during the DIY process. :-D . If you are interested, I could custom make one to suit your pond filter as I still have some parts left from building mine.
    Post edited by Alvin at 2012-08-02 06:32:33 pm
  • pandaipandai August 2012
    Posts: 1,083
    Hmmm... perhaps u can PM me an estimate??? :-?
    Get Kenkona Koi and Kenkona Bio at special price online at http://kenkonakoi.blogspot.com/
  • ShukriShukri August 2012
    Posts: 4,881
    Yeah! Definitely DIY for the pros........not for normal people like me......... :-D
    In Koianswers Forum, no one individual is above the rest. This is the Forum for the Koi Community.
  • grinkz01grinkz01 August 2012
    Posts: 530
    bro alvin...rather than relying on steel screen, is it possible to combine with filter cloth (ie Sefar product)? u can choose low air permeability but with high flow model? dont know if workable/not...
  • AlvinAlvin August 2012
    Posts: 84
    Bro Shukri,
    All koi kichi are pro DIY person. As can be seem from all the creative DIY and idea posted on this forum. :-D

    Bro Grinkz01,
    Thanks for the info. i will try to contact them for more info on their product. (handshake)
  • jamiltjamilt August 2012
    Posts: 287
    very impressive bro (Y)
  • AlvinAlvin September 2012
    Posts: 84
    Bro Kwick,
    Do you have picture of the modified answer?. I don't know what is it....Is it a sieve?

    My Rdf has been running for the past two month and performing well. Never do any cleaning since then until now :-D . I will post some of the result and video once I have the time.

    I am using 120watt 3phase 220v motor with worm gear box of ratio 60. I get around 7 revolution per minute on the drum but can be adjusted using variable speed drive. Why don't you post a sketch of your Rdf so that we can help you on the design or pm me.
  • AlvinAlvin October 2012
    Posts: 84
    This 410 answer function similar to Rdf but not effective in removing fish waste immediately from filter. Rdf design is a bit more complicated and require a sturdy frame and higher water spray pressure. Do you have you Rdf drawing?
  • sivakoisivakoi May 2013
    Posts: 106
    Hi Alvin,

    Neither I have the patience or the skill to build one. But the system seem to suite lazy people like me :-D

    Been reading up on RDF and it has really some clear benefits. Just want to get your thoughts compared to bead filter type system.

    Does it require quite a number of modification to use RDF for a down up filtration system?

    How is the system thus far?

    Thanks for sharing bro, junior like me sure can do with some guidance. (handshake)

    Bro Pandai, did you manage to get any input from Sentul Koi Park ?
  • AlvinAlvin May 2013
    Posts: 84
    Bro kwickcut,

    I will provide a simple sketch for you as a reference.

    Bro Sivakoi,

    RDF is purely a mechanical filter system. I don't have any experience with bead filter so can't comment much on this.
    you need major modification to in cooperate into your up/down filtration system (Bottom drain type) unless your is pump fed system. Pump fed system is just plug and use.
    Water clarity is very good and waste is discharge out of the pond every 10-25 min. Just need to do some minor cleaning every 2 month (flushing with water).
    Water parameter is good and koi are healthy. I am using only RDF and Bakki shower for my 10 ton pond.





  • pandaipandai May 2013
    Posts: 1,083
    Bro @sivakoi,

    Unfortunately, no. I can't remember already whether I emailed or sms-ed them but either way, didn't get any reply. :-(
    Get Kenkona Koi and Kenkona Bio at special price online at http://kenkonakoi.blogspot.com/
  • frostbitezfrostbitez July 2013
    Posts: 109
    best mechanical ever
  • kwickcutkwickcut July 2013
    Posts: 25
    i dont know what has happened but all of my posts are gone....

    bro Alvin,
    sorry for the later reply but if you are still willing to send me some drawings that would be great.. family and work have been keeping me very busy..


    thanks

    kwickcut
  • AlvinAlvin July 2013
    Posts: 84
    Hi kwickcut,

    Please check your email to view the sketch drawing Rdf.
  • kwickcutkwickcut July 2013
    Posts: 25
    thank you very much Alvin its a great reference
  • kwickcutkwickcut August 2014
    Posts: 25
    Bro Alvin i finally went and build an rdf for the most part it came out well.. but i do have to make a few tweaks to make it 100%.. i tried to post the video but cant get it to work so this is the link.. any input would be great

    http://youtu.be/pfFEuhBmObY?list=UUG6-WlNSbLRIFoCunPtgQfw

    kwick

    Post edited by kwickcut at 2014-08-15 09:57:17 am
  • kwickcutkwickcut July 2015
    Posts: 25
    Bro Alvin,

    i was wondering did you make your box or did you use something that was already made and adapt it for your use..
  • AlvinAlvin August 2015
    Posts: 84
    It is custom made fiber glass box. ( thickness around 6-7mm).
  • kwickcutkwickcut October 2015
    Posts: 25
    Bro Alvin,

    thank you for the reply about the box. i have bought all the materials and will try to fabricate a new box over the winter to replace the one i have now. another question about the box. is this a wood box covered with fiberglass or is it just fiberglass with no wood? thank you for the reply..

    below is the 2nd version of my DIY RDF. now the grating has been removed and the discharge pipe has been replaced with a tray style discharge. you can see the changes is the second video.





    i will post back when i make the new box and a few other upgrades i have been thinking about..

    thanks for your help


    kwick
    Post edited by kwickcut at 2015-10-16 11:44:06 am
  • AlvinAlvin November 2015
    Posts: 84
    Bro,

    It is fiber glass without the wood (No wooden frame). Your RDF look good =D>
  • kwickcutkwickcut November 2015
    Posts: 25
    Thank you Bro Alvin...

    i have to make a few tweaks to the discharge tray we have really big leaves and they clog the tray, but other then that its working great.. i will be attempting to make a fiberglass box soon. when i get it done i will post another video.. i would love to see your rdf in operation..

    kwick
    Post edited by kwickcut at 2015-11-05 10:23:37 am


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