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  1. C

    Still struggling with CO2

    If you don't mind changing your drop checker permanently a good way to provide a convenient integral white background is to cut a ring of clear 13mm pvc tubing thin enough to fit through the drop checker neck (about 3mm)and push it into the bulb. The tubing will turn white in a day or so and...
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    Another furrowed brow in this business we call flow!

    Hi again Joe (that's better!) If you run a filter on one branch and the extra pump includes an inline heater then I doubt you'll want to turn either off in which case back flow won't be an issue. However if you only run co2 off your extra pump and stop it when co2 is not in use then whilst you...
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    Another furrowed brow in this business we call flow!

    Morning J Butler (very formal) try googling pumps in series v parallel. Basically what you propose is putting 2 pumps in parallel which means that in theory the resultant flow will be the sum of each individual flow (although in practise it is usually somewhat less). As long as the resultant...
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    Spraybars and Circulation Pumps

    Hi Foxfish. What I am saying is that the resistance to flow of a number of small holes will always be greater than the resistance of a single hole with the same cross sectional area of all the small holes added together - primarily because of the increased turbulence at each hole. The smaller...
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    Spraybars and Circulation Pumps

    Hi Greenview ! Sorry only just seen this post. Have you considered an external circulation pump which can be hidden in your cabinet and connected directly to a spraybar (or any other outlet) ? I use an eheim compact + 2000 modified as a needle wheel for CO2 - the CO2 is introduced before the...
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    Drop checker time lapse & CO2 schedule

    Exactly, or when it's removed from the aquarium water or anything that upsets the equilibrium. It's establishing the equilibrium that takes time but once coupled it will change colour as the tank CO2 concentration changes (which isn't very quickly under normal circumstances - hence the 2 hours...
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    Drop checker time lapse & CO2 schedule

    You're overthinking it niru lol
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    Drop checker time lapse & CO2 schedule

    Don't get so hung up about the drop checker time lapse. When you first put it in the water it takes a while for the liquid in the bulb to reach equilibrium with the aquarium water and for the indicator to change colour because this relies on the rate of gas transfer through the funnel and...
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    Aqua one aquis

    I've had an Aqua One 1000 running since Jan 2007 with no problems - gives a steady 600 lph. I even left it running for a couple of days with the taps closed once with no ill effects. The instructions leave a bit to be desired though. Its design is very similar to the Eheim 2222/2224 so I...
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    Pipes & flow rate

    Morning Idris - I agree. Fluid dynamics are not nice. You're probably not bothered now but I just had a thought. I remembered seeing a table of flows under gravity (drains essentially) for different size pipes so you don't have to factor in pumps, velocities, lengths etc. I've had a search and...
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    Pipes & flow rate

    Back to the original question ! You can't really predict flow directly from pipe diameter alone. In a nutshell fluid flowing through a pipe is subject to resistance from various sources one of which is friction caused by rubbing against the sides of the pipe. The amount of friction is related...
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    inline reactor not connected to ext filter suggestions

    You don't need hozelock tubing - it's too hard. Normal air/co2 tubing works fine and will give you a good seal as long as there's a slight bulge in the tubing over the barb. I must admit that I do use a small cable tie under the barb to ensure it doesn't come off though.
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    inline reactor not connected to ext filter suggestions

    Yep I've sheared them off too !! The connectors can get a bit tight when screwing in for the first time and you will need a spanner. That's why you really need to tap the hole first but wetting it or applying a tiny smear of vaseline or silicone to the threads can make things easier. Make sure...
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    inline reactor not connected to ext filter suggestions

    You can install a bleed valve using the parts described here: viewtopic.php?f=20&t=12745 Drill a 4.5mm hole right at the top of the reactor,install a hozelock connector and then attach a short piece of airline with a valve (just like the AM1000 reactor). To prime it just open the valve until...
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    2kg CO2 life?

    My favorite subject ! The following equation will give you the life of a gas cylinder in days. No days = 36141 * (weight of gas in kg) / (bubble count in b/s)*(hours per day) * (bubble radius cubed) For example: Bubbles from my JBL bubble counter are approx 6mm diameter (3mm radius) so 2kg @...
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    How long would a 500g or a 2kg cylinder last?

    You can calculate the length of time your CO2 should last (in days) using this equation. I can explain the maths if you want but basically 1kg of liquid co2 will expand to form about 155 litres of gas at room temp and pressure and it follows from there but bubble size is very important. From my...
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    Co2 Solenoid

    The hard click when the solenoid is turned on is the plunger hitting the base of its housing. I don't get it on mine any more but it still works. I agree with Fly - try it without the timer just to check. I got one of those plastic rings (maybe 2mm thick and white ?) with my needle valve. I...
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    Co2 Solenoid

    If it's working properly gas shutoff should be instant. Mine used to leak a bubble a minute or so so I took it apart. Not the same model but same principle I expect. Inside there will be a plunger with a rubber seal and a return spring. When the power is on the solenoid pulls the plunger up so...
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    CO2 Reactor - Advice/help etc

    Hi LondonDragon - just curious about you using the up atomiser before the reactor. Don't the tiny co2 bubbles get pushed straight through without dissolving? I used to use a mazzei and then a modified Eheim 2000+ as a needle wheel but didn't like the huge amounts of mist in the tank. So I made...
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    Bleed valve and CO2 connection for a reactor

    For those of you contemplating making an inline reactor I found the major bugbear to be connecting the CO2 supply and bleed valve to the reactor body without leaking. I tried several glues with limited success before coming across the following solution which requires nothing more than a...
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    Too much gas??

    Don't you just love a bit of controversy :D The CO2 duration calculation is completely independant of tank conditions - it takes no account of how many bubbles per second are required to acheive a certain concentration in a certain sized tank but rather how long a certain amount of liquid CO2...
  22. C

    How long CO2 canister should last, bps based?

    Have a look at this thread http://ukaps.org/forum/viewtopic.php?f=37&t=6885
  23. C

    Where to get CO2 Cannisters and Refills

    Ace thread ! For Hull and East Yorkshire you can get CO2 from : Broadman Ltd Dairycoates Industrial Estate Wiltshire Road Hessle Road Hull HU4 6PA 01482 506050 A 3kg cylinder costs £2.50 per month to hire plus £10 per fill plus VAT. You can take your own cylinder to fill but they can't do...
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    co2 refill

    There's a formula in this thread http://ukaps.org/forum/viewtopic.php?f=37&t=6885 which will tell you how long your CO2 will last
  25. C

    Mazzei venturi

    Hmmm that was interesting ! Just rigged up an Eheim compact 2000 into my return feed in an attempt to increase flow and pressure with the mazzei. My idea was to connect it between the filter and mazzei, remove the canister's impeller and hey presto ..... more flow. To test it I left the...
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    Mazzei venturi

    Here's a link to where i bought mine from but it was black and £8 cheaper ...
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    Mazzei venturi

    Amongst other things I joined this forum to try and find more info on using Mazzei venturis so as this appears to be the only specific mazzei/co2 thread forgive me for resurrecting it - my experiences might be of some use to someone. Apologies for the length I have tried various methods of...
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    Too much gas??

    Just joined - hi everyone ! You can calculate the length of time your CO2 should last (in days) using this equation 36141 * (weight of CO2 in kg) / (bubble count in b/s)*(useage in hours per day)*(bubble radius in mm cubed) Use the weight of co2 in the cylinder not the total cylinder weight...
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