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  1. #1
    Extreme Koi Member Rank = Nanasai davec's Avatar
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    Help adding another pump to bio

    I want to add another pump to my drum bio set up as Iím pulling water to fast through bio I have 2 options I have an extra outlet on my bio which is directly below where water enters from drum can i put my pump on there as outlet is directly where water enters. the bio this would be much easier alternatively Iíd have to get some bits and blank one inlet off and pull directly from the drum Iíve added a pic of outlet thatís directly below where water comes in from drum it currently just as a valve IMG_0610.jpg


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  2. #2
    Extreme Koi Member Rank = Nanasai davec's Avatar
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    Picture 1 is outlet I currently use this picture is of my other outlet under inlets I want to know if I could put another pump on and slow pump on other outlet down and use outlet in this picture with another pump on would this work and give a bit more dwell time in bio chamber IMG_0609.jpg


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  3. #3
    Extreme Koi Member Rank = Gosai NickK-UK's Avatar
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    Quote Originally Posted by davec View Post
    ... I’m pulling water to fast through bio ...
    Just curious - why do you say that you're pulling water too fast through the bio?

    I was reading this recently:

    Ammonia-conversion-rate-as-a-function-of-the-hydraulic-load-and-the-volumetric-flow-rate.png

    It is seen that an increase of the flow rate increases the ammonia conversion rate. On the other hand, one should take into account the maximum permitted limit of ammonia outlet concentration. The bold line in figure 2 divides the diagram into two areas. The area below the line is where the outlet ammonia concentration lies below the maximum permitted limit of 0.5 mg/l.
    Source: Ammonia conversion rate as a function of the hydraulic load and ...


    So to my point.. if the problem is the conversion of ammonia or nitrites then reducing the flow isn't going to improve it. My question is - how much media surface area do you have in the bio?

    The "hydraulic load" is simply saying you need a larger area of media for the volume of water being processed per day. So having the right area of media for the volume of water being processed and then running through at the most efficient (cost of speed vs % removed per cycle).


    Not being rude I hope.

  4. #4
    Extreme Koi Member Rank = Nanasai davec's Avatar
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    Ammonia or nitrite isnít a problem but interesting the tables youíve posted I have a bio chamber 90 cm tall 60 cm wide 45 cm length I have 75 litres of hel x and 12.5 litres of eco pond chip I run my vari pump 20000 at 70 percent I was just wanting to increase the pull from my gravity skimmer without wacking the pump up full belt but if Iím just wasting money and time by doing it might as well leave as is thanx for reply


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  5. #5
    Extreme Koi Member Rank = Gosai NickK-UK's Avatar
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    Quote Originally Posted by davec View Post
    Ammonia or nitrite isn’t a problem but interesting the tables you’ve posted I have a bio chamber 90 cm tall 60 cm wide 45 cm length I have 75 litres of hel x and 12.5 litres of eco pond chip I run my vari pump 20000 at 70 percent I was just wanting to increase the pull from my gravity skimmer without wacking the pump up full belt but if I’m just wasting money and time by doing it might as well leave as is thanx for reply
    Ahh I'd go for the drum if the skimmer would pass through the bio.. dirt in the bio isn't what you really want. It also makes it easier to balance the flow rates between the BD and skimmer.

    Next question what's the BD and skimmer pipe diameters?

    The reason I ask is the draw through the skimmer and BD would be (in total) the same unless you increase the pump speed. The ratio of water drawn from BD and Skimmer in a gravity feed is normally dictated by the ratio of area of the pipes (ignoring any friction from the piping). 4" BD with a 4" Skimmer feed would be 1:1 (7000lph each) whereas a 4" BD with a 2" Skimmer feed would be: 12.5:3.1 ie 4:1. (12Klph for BD and 3Klph for the skimmer). Only way to change that is restrict the BD pipe by closing off the valve slightly to reduce the diameter of the BD pipe or install a larger skimmer pipe for the gravity feed.

  6. #6
    Extreme Koi Member Rank = Nanasai davec's Avatar
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    Bottom drain 4 inch skimmer 3 inch


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