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Help me understand "Turbo Twist" UV's


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Hi

I am at a loss as why these are better than normal UV's. Let me explain my confusion..

If we take 2 UV units, exactly the same size, one with "turbo twists" (and more expensive) and one normal unit. We then put them on a filter that pumps 500l/h. Now, 500l/h is passing through the UV. In the "normal" UV it enters the UV, slows down as unit is thicker than pumps tubing, spend a certain amount or time in the unit and then exits and speeds up again. So far so good. Now the "twisted" UV. The water enters and probably does not slow down but rather goes round and round and round etc until it exits the other side, BUT it will take 1 litre of water the same time to go through both because that is a function of the pumps output. So.... One has a slow flow and one has a fast spiraling flow but both for the same time.

Is it therfore any advantage in having a new fandangled "turbo twist" UV as the contact time is the same in both instances?

I realise that this argument is based on an assumption that the 2 units are the same size and hold the same amount of water. If one has a greater volume it would increase the contact time and therefore be more effective.

Is my reasoning correct? logical?

Cheers

Brian

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If the filter has a greater volume it won't increase the contact time (I don't think). Once it's full, a litre will pass through a 100 litre area as fast as it would through a 2 litre area, assuming the pump output is the same in both cases and the distance from input to output was the same. It would just take longer to fill originally.

A litre of water going around the tube several times on the way through would take longer to travel the same distance in a straight line.

That's how I see it working anyway. Plus I imagine the closer the water is to the tube the more effective it is. A large volume filter would mean less water is close to the tube.

Hmmmm having just written that, I'm not so sure. If the volumes and distances are the same, the twisting water will cover more distance, but still be in contact with the light for the same time......

I'll have to ponder it some more :lol2:

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Im not sure what the turbo twist is exactly, but anyways. Im pretty sure the speed of the water in a same size pipe and same size pump would be equal. THe speed would be the same but the distance is different so therefore the water would be in the twisting one longer, due to the longer distance.

Its like if you could drive home along a straight line or through bendy roads. Even if the end goal of home is the same distance as the crow flies, the two roads distances will be vastly different.

Adam

=]

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I too have never heard of this “twisted” UV. I like AdamR explanation, but I tell you what, if this is correct, the amount of extra time the water spends inside the UV would be marginal. You’ll get more benefit putting the water through at a slower rate (increasing contact time).

Yee-gads! I like gadgets, but I can’t see any great reason to spend more money on what will have little if any appreciable difference.

Surly the packaging will give some explanation as to this “twisted” benefit?

Perhaps this twisting causes the water to churn matter about, making it more likely for nasties to come closer to the UV tube?

Craig

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I'd suggest the twisting produces much more convection. The closer the water to the tube the greater the effect. The more convection the more water that is closer to the tube for maximum effect.

(That said, as the paper below suggests the flow rate is the importact factor when considering the exposure.

Here is a small page describing UV tubes.

http://rael.berkeley.edu/uvtube/uvdisinfection.htm

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I got this reply from the manufacturer:

Quote

Greetings Brian,

Normal UV units use a linear path that goes from one end to the other. This water should pass as thinly as possible between the outside housing and the quarts sleeve. So there is no “open” path to slow the water down inside the unit. The fittings are larger, but the actual inside dimensions are smaller.

The Turbo Twist utilizes the spiral flow path to allow the same or longer contact time with the UV light in a much smaller unit. Since our units are more compact, it is easier to keep on the back of the aquarium or under the stand. In some instances it is hard to have a 36” or 48” standard UV unit on a corner tank, column tank or even hex tanks since there volume is vertical not horizontal. That is where a compact UV comes into play.

I hope this helps and if you need more information, please let me know.

Regards,

John Groff

Technical Support Specialist

Central Aquatics

jgroff@central-aquatics.com

End Quote

Bit of marketing mumbo jumbo I think.

Cheers

Brian

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This bit "This water should pass as thinly as possible between the outside housing and the quarts sleeve" is important. And also suggested as significant in my paper. I reckon that bit may not be marketing hype. (Could be and my hype radar is on the blink too :) )

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Pretty much a muchness I'd say. If there is truth in what is said, they are really only advantages when space is an issue.

As I see it, water that passes through a standard UV is not exactly going to go through in a straight line, there will be a lot of turbulence inside the chamber. Having a UV tube that is twisted will cause more turbulence, but how much more would be an advantage?

Much greater benefit will be gotten from slowing the water down, in either a straight UV tube or a twisted one.

As best as I can tell, if space is not an issue, look at the UV output, and just put a standard UV onto the tank. If space is an issue, perhaps (?) a twisted UV could be considered, but for my money I wouldn't be paying more for it as I think the benefit gained if any would be limited at best.

Craig

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