Spraybar and skimmer inlet

Discussion in 'Filters, Filtration and Pumps' started by Andrew Butler, 10 May 2019.

  1. Andrew Butler

    Andrew Butler Member

    Messages:
    1,143
    Location:
    Banbury, Oxfordshire
    I've read in a few places about weirs and spraybars not being effective so I assume that would rule out using a spraybar and a skimmer inlet too? - anyone any experience or ideas to offer?
    Andrew
     
  2. ian_m

    ian_m Global Moderator Staff Member

    Messages:
    4,952
    Location:
    Eastleigh
    Not too sure where you have got these kind of half truths from ?

    A spray bar, positioned slight below the surface of the water, is one on the most excellent ways of getting decent water flow and distribution around the whole of a tank. This is even more so if you are injecting CO2 via an inline CO2 atomiser, allowing you to easily achieve the rough rule of thumb, for CO2 injected tanks of filtration rate being 10 times per hour the tank volume. ie tank volume of 100litres will need a 1000litre/hour filter. Also allowing slight surface ripple allows oxygen exchange into the water, but with slight minus of degassing CO2.

    The issue with skimmer inlets in CO2 injected tanks is the falling/splashing water in the inlet rapidly degasses and CO2 you have spent all that effort injecting into the water. It can be done, by having monsterous CO2 injection rate to offset the losses but really is not recommended.
     
  3. Andrew Butler

    Andrew Butler Member

    Messages:
    1,143
    Location:
    Banbury, Oxfordshire
    I'm a lover of spraybars but also don't like the surface film that accumulates without the use of a skimmer and the 'fashion' at the minute seems to be combined skimmers/intakes which I have tried and do like but I've never tried one with a spraybar as I read about spraybars and weirs not working together so assumed it would be the same with skimmer inlets- I will have to hunt the threads out.
     
  4. ian_m

    ian_m Global Moderator Staff Member

    Messages:
    4,952
    Location:
    Eastleigh
    I don't get a surface film.

    Usually a surface film is an strong indication something is out of balance in the tank. Surface film can occur in new tanks as plants/water/substrate "settles down" and in mature tanks is a sign plants are suffering releasing organics (oil) into the water.

    You need to treat the cause rather than the symptoms. Possibly poor CO2 flow and distribution, too much light for CO2/fertiliser levels, something missing from fertiliser, new plants adjusting to new environment, dirty filter, without knowing more details of your tank and its setup it is hard to recommend a course of action.

    Another way to get rid of surface scum is use an air stone & air pump which will agitate the surface and get rid of any surface film. If using CO2 this can be run outside of CO2 hours of course.
     
    dean likes this.
  5. Andrew Butler

    Andrew Butler Member

    Messages:
    1,143
    Location:
    Banbury, Oxfordshire
    I will have to look these posts up but I know I've read many times about a surface film being the normal.
    It is very dry/static like in my room and dust seems to appear from nowhere, not an excuse - just possible reason?
    My setup isn't currently running so I'm unable to give you any pics or further info.
     
  6. Aqua sobriquet

    Aqua sobriquet Member

    Messages:
    824
    Location:
    Dorset
    I use to have a lot of trouble with surface film on one of my old Aquariums. I put it down to the oils in the fish food. Not much you can do about that if you have fish, they have to eat.

    Many people have problems with surface film, I guess that’s why there are lots of surface skimmers available out there.

    I would think that any large disruption of the water surface either by it going into the filter via a weir or out of the filter, say with a spray bar above the surface, will cause loss of CO2?

    I think a small skimmer should solve your surface film problem. As others have said, you can use a skimmer permanently on say a canister filter inlet or you could use something like the self contained Eheim unit as required?

    https://www.swelluk.com/eheim-skim-...MIpsDorIOR4gIVZrvtCh1PhQFeEAQYAiABEgI6OvD_BwE

    There are other options out there if you look around. Good luck, let us know how you get on.
     
  7. Andrew Butler

    Andrew Butler Member

    Messages:
    1,143
    Location:
    Banbury, Oxfordshire
    Thanks for the advice, I used to run the little Eheim skimmers on a timer but I'm just trying to cut down on things in my aquarium with that regard.
     
  8. Aqua sobriquet

    Aqua sobriquet Member

    Messages:
    824
    Location:
    Dorset
    Yes it can be tricky keeping keeping tech stuff in the tank to a minimum! :)
     
    Andrew Butler likes this.

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