UV Sterilizer placement.

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Basically decided I'm going to run my UV on a separate pump but wondering which part of the sump to pick it up from and return it to would be best?

I was thinking of picking it up from the last chamber - through the UV - back to the first chamber.

Apparently the lethal dose for free floating WS is 72,000mw of UV per second. (I would like to run Ozone but isn't the tank supposed to be well matured first?)

That means my V2 Vecton 600 that has a 25w (25,000mw) bulb that is supposed to hold roughly 0.5 litres of water will have to have a throughput of 625lph for it to be efficient.

72,000mw/25,000mw = 2.88 seconds of contact.

So 60 seconds divided by 2.88 seconds of contact time multiplied by 0.5 litres equates to 10.42lpm or 625lph ((60/2.88*0.5) = 10.42lpm or 625lph)

So in my eyes a 600lph pump should suffice for an adequate flow rate.....maybe a little slow but I'm sure the pump will give or take a little %.

I know this won't kill any parasites on the fish but is mainly just precautionary......I hope!
Last Edit: Nov 13, 2014 9:51:14 pm by carlcall

HK_Fuey

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Reply #1

Do you have white spot?

I wrote a post of here just recently about white spot.  I recommend giving it a read.  From the research I did, I learned that although UV does kill ich, it will never get it all, as much of the water will pass it by, and ich can sit in the sand and rocks in a kind of hibernation stage.  Sorry to be the bearer of bad news.
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carlcall

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Reply #2

No I haven't got WS and I have read most of what you wrote the other day and was sidetracked when a mate came round.

It was mainly as a precaution as I have a two spot bristle tooth, a yellow tang and a caribbean tang. The latter one gets stressed out really easily.


HK_Fuey

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Reply #3

Well then, it can't do any harm, and if there are any ich parasites in there, it should reduce their numbers.
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Mike

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Reply #4

Your numbers all seem fine, I'd be worried about dilution though if it's plumbed the way you're suggesting.

If you had a 100L tank and a 100L per hour turnover rate through your sump, that doesn't mean the entire water is going through the sump once per hour, as a good proportion will go through twice, three times, four times, etc, as it's constantly in flux of dilution.

The exact same situation is going to happen in the sump if the UV pump is taking from the return chamber and returning to the inlet chamber. So how long will it actually take before the entire volume of water has gone through the steriliser just once?

This is why UV struggles to be effective unless it's massively oversized. It'll be effective at clearing the water abit, as it'll inhibit water born zooplankton, phytoplankton, algae and bacteria, but larger things like parasites, even in their free-floating stage might never go through the steriliser.

Can it not go on the return line, so it's much more "in the loop", and you're cutting out one dilution ring?
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carlcall

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Reply #5

It's already on the return but I'm trying to slow down the pass through speed so it makes it more effective.

So can Ozone be run on a relatively new tank as I'm sure that I have read it should only be used on tanks approx 12+ months old.

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Reply #6

When I was running UV I had it set up in one of the middle chambers, I had the inlet and outlet in the same chamber with a small pump think it was 400-600Lph, the UV unit was 36watt.
I should really sort this out!!

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carlcall

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Reply #7

When I was running UV I had it set up in one of the middle chambers, I had the inlet and outlet in the same chamber with a small pump think it was 400-600Lph, the UV unit was 36watt.

What are you running now?

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Reply #8

What are you running now?


Nothing! I was running it whilst the tangs were settling in, and then it kept tripping the mains, guessing moisture has got in, just need to open up and check inside, and get a new bulb.

I have a purple, sailfin and caribbean blue tang
I should really sort this out!!

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Reply #9

I was running ozone for a while, which killed off my prolific Xenia, which just melted away, with no other adverse effects on the tank! I'd target an ORP of between 395 and 420. Some suggest higher, but probe accuracy is a factor, so best to have some margin of error as 450+ is dangerous.

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