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internal UV filter recomendation?

This is a discussion on internal UV filter recomendation? within the Freshwater Aquarium Equipment forums, part of the Beginner Freshwater Aquarium category; --> If you want maximum benefit, why can't you just pop a UV directly into the water? I am sure there are some units that ...

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internal UV filter recomendation?
Old 04-11-2013, 06:43 PM   #11
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If you want maximum benefit, why can't you just pop a UV directly into the water? I am sure there are some units that don't have cases and pumps that you can submerge straight... might not be specifically for aquariums... issues with fish and UV exposure perhaps so put one in a PVC tube suspended vertically just off the bottom. The bulb will probably produce a bit of convection, keeps the flow low.

With the tank units you are dealing not only with high flow and low wattage but high turbidity that basically shades most of the water. The only exposure is that very first film of water against the lens unless you go inline after the filter and that is only good if the filter is doing a very good job of cleaning the particulates out... fine, fine filter media.

Jeff.
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Old 04-11-2013, 06:58 PM   #12
 
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Amazon.com: Aqua Medic Helix Max UV Sterilizers 36W Bulb: Pet Supplies Amazon.com: Aqua Medic Helix Max UV Sterilizers 36W Bulb: Pet Supplies

scroll towards the bttom for flow rates, im looking at the 9 watt. the slower the pump the better the uv effect correct?
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Old 04-11-2013, 07:33 PM   #13
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Amazon.com: Aqua Medic Helix Max UV Sterilizers 36W Bulb: Pet Supplies

scroll towards the bttom for flow rates, im looking at the 9 watt. the slower the pump the better the uv effect correct?
Yes. They list "up to" ratings, those are too high but this looks to be aimed at putting onto a canister output directly as the clearest water will be there.

If you were using a canister you could "T" from the canister output and split the return to skip the extra pump and keep the flow low. Even a cheap fountain pump up into the light then just back into the tank would be all you would need.

Jeff.
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Old 04-11-2013, 08:03 PM   #14
 
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Quote:
Originally Posted by JDM View Post
If you want maximum benefit, why can't you just pop a UV directly into the water? I am sure there are some units that don't have cases and pumps that you can submerge straight... might not be specifically for aquariums... issues with fish and UV exposure perhaps so put one in a PVC tube suspended vertically just off the bottom. The bulb will probably produce a bit of convection, keeps the flow low.

With the tank units you are dealing not only with high flow and low wattage but high turbidity that basically shades most of the water. The only exposure is that very first film of water against the lens unless you go inline after the filter and that is only good if the filter is doing a very good job of cleaning the particulates out... fine, fine filter media.

Jeff.
Because of fluid dynamics. The current in the tank is not enough on it's own to force the water through it (especially a twist design) in an efficient enough way. If you mean why can't you just put a UV bulb in the water, it's because it's harmful to look at - I imagine it would damage the eyes of the fish as well.

In tank units, like the green killing machine, work very well, without the water being prefiltered.
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Old 04-11-2013, 08:08 PM   #15
 
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I have some powerheads 150 gph ratings I belive, they can be made into utility pumps, I had planned on switching one of the pumps to the ultity mode and using it to power that uv unit. no canister and no plans of getting one.

a low gph pump around (what recommendation) would work with that unit? only staying away from the green machine since bad reviews.
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Old 04-11-2013, 08:19 PM   #16
 
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only staying away from the green machine since bad reviews.
Too bad. 46 out of 55 reviewers on petco.com recommend it, with a 4.4/5 star rating. Out of 102 amazon reviews, 71 gave it 5 stars, 13 gave it 4 stars. It's about a 4.5/5 star rating there too. I give it 5 stars. Those are pretty solid positive ratings, but whatever....

Last edited by jaysee; 04-11-2013 at 08:23 PM..
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Old 04-11-2013, 08:20 PM   #17
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Because of fluid dynamics. The current in the tank is not enough on it's own to force the water through it (especially a twist design) in an efficient enough way. If you mean why can't you just put a UV bulb in the water, it's because it's harmful to look at - I imagine it would damage the eyes of the fish as well.

In tank units, like the green killing machine, work very well, without the water being prefiltered.
The current would be just for a straight bulb submerged inside of a vertically mounted PVC open ended pipe. That was my afterthought to cover the UV light from exposure to eyes and to contain the convection to close proximity to the bulb lens. I know it couldn't force water through the external unit.

I suppose that, unlike a drinking water unit that only gets to treat the water in a single pass, these get to recirculate for multiple passes and the efficiency in the exposure is offset by this multiplicity as long as there is some killing going on each time.

Does the glass or quartz lens need to be cleaned on these occasionally?

Personally I don't see that this is the answer as it only treats a symptom. I am always against symptomatic treatments of any kind except where the symptom is bad enough to require treatment until the real cure can be figured out.

But that's just me.

Jeff.
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Old 04-11-2013, 08:30 PM   #18
 
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AA Aquarium Green Killing Machine Internal UV Sterilizer Review

If the latent benefit of clearing the green water is killing parasites and other pathogens, I'm alright with that...

I've not had to clean the bulbs - the light they emit seems to keep it clean.
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Old 04-11-2013, 09:04 PM   #19
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I noticed in their review that all they did to produce the green water was to overkill the lighting. Would stand to reason that the fix is just to kill the lights for a period then bring them back up until balance is reached again.

I know, easier said than done.

Jeff.
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Old 04-11-2013, 09:07 PM   #20
 
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deal with some GWA then let me know what ya think Jeff :P been looking into a green tank for about 2-3 weeks now
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