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swole nation 05-02-2013 09:20 AM

UV sterilizer too much dwell time?
I have done a ton of research on this but haven't been able to figure out how much dwell time is too much. I stumbled upon a couple of great deals, a Penn plax 700 canister for $50 and an 18 watt coralife turbo twist for $60. The turbo twist recommends min 200 max 400 gph but the penn plax is rated at 185gph so will be lower with media. Would that much dwell time have negative effects on the water? Or would it actually be more effective...any educated answers would be appreciated!

fish monger 05-02-2013 10:09 AM

From what I've read here on the site, slower is better. It doesn't seem like too much dwell time would hurt anything; however, you want your system to be efficient also. I'd error a little on the slow side if I was to purchase a UV system.

swole nation 05-02-2013 10:15 AM

Thanks for the response. Yeah I've gathered the same from what I've read just wasn't sure if there is too slow. Forgot where I read it but someone had a theory too much dwell time could almost like bleach the hard facts. Still got me wondering though
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fish monger 05-02-2013 10:57 AM

All of the "sterilizing" systems kind of scare me. Were I to purchase one, it would be for use in an as needed basis as an option to chemicals. My setups are very simple, so take that into account.

Geomancer 05-02-2013 12:24 PM

I can't think of a reason to have one in the first place to be honest.

They seem like only a solution to a symptom and not the solution to a problem. Pathogens shouldn't be entering a tank, except by new fish but they should be quarantined anyways.

As for green water, that's a too much light issue usually, but I suppose if the only possible place for a tank was somewhere in direct sunlight you may have to, but I still think you'd end up with other algae issues.

AbbeysDad 05-02-2013 02:24 PM

I also think there's no such thing as too much dwell time while too little to kill parasites and/or algae would make it pointless to use.

As already mentioned, the use of a UV sterilizer is considered by many members to be unnecessary and considering the numbers of successful tanks running w/o a UV sterilizer, it's hard to disagree.

swole nation 05-02-2013 05:01 PM

I agree, I've never used one but I'm setting up a tank with an electric blue jack dempsey and I've heard they do them wonders. Plus can't beat the price. Thanks for the opinions.
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MoneyMitch 05-03-2013 04:17 AM

too much dwell time in a uv... not heard of that one, I couldn't possibly see any ill effects coming from this even in a planted system. I would advocate the use of a UV light if you have the money to spend on them. I look at them as a added insurance along with weekly w/c's. some people swear by them some people say they are useless but if setup correctly flow rate/wattage their results show for themselves.

I wouldn't use a uv to treat a issue usually but more as a prevention. when I was looking into getting one I was recommended a 30 something watt with like 90 gph flow. even with a higher watt you would want your flow under 100 gph IMO - you get better uv effectiveness.

swole nation 05-03-2013 04:25 AM

Thanks MoneyMitch that was the best answer for my question!

jaysee 05-03-2013 11:35 AM

Wattage and flow rates are directly related - The lower the wattage, the lower the flow (more dwell time), the higher the wattage the higher the flow (less dwell time). 30 watts is pretty high for a UV filter, so while one could pair that with a low flow pump, the things aren't going to get any deader by spending the extra time in front of the bulb.

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