UV light=less flow=Bad? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 03-02-2012, 11:57 PM Thread Starter
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UV light=less flow=Bad?

Just hooked up a in-line uv.The return flow to tank is less than half but still moving.Im running a fluval 405 on 55 gal tank.It was on full blast.would that be to much anyway?Now its like I dropped the flow on the filter.Will I be ok?
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post #2 of 11 (permalink) Old 03-03-2012, 12:13 AM
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It sounds like the UV unit has fittings on it that are restricting your water flow. You shouldn't loose much flow with a UV unit.

If you are worried about contact time in the uv unit, the correct way to plumb it would be to use a T and valves. Plumb one to the uv and the other directly back to your tank. Then use the valves to control the flow through each.
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post #3 of 11 (permalink) Old 03-03-2012, 01:38 AM Thread Starter
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Im not worried about flow to the uv.As it is Im probably under as its a 25w.Im concermed about the filtration being cut way down.Anyone know what the GPM should be on a 55 gal tank?
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post #4 of 11 (permalink) Old 03-03-2012, 02:50 AM
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Rule of thumb: is tank size x 5 - 10, which, in your case is roughly 300 - 500 gph.

I am a bit surprised that your flow got reduced that much with your UV unit. You might want to check the manual to see if it has a flow restriction for increasing the contact time.

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post #5 of 11 (permalink) Old 03-03-2012, 03:07 AM Thread Starter
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No restrictions,Its a hollow PVC tube.I had to run a line to uv,plus the water through the tube.Maybe the extra "tank" and lines are slowing flow.On the right you can see a loop in return hose.Im going to cut and shorten.But if thats not the problem then Im screwed because if it doesnt increase flow,i cut my return line to short to to eliminate uv.
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post #6 of 11 (permalink) Old 03-03-2012, 03:19 AM
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That is a pretty unnecessarily large UV sterilizer for a 55. I realize sometimes bigger is better, but I had a 75 with complete green water and dropped in a little submersible 9W and it cleared it within a week. The thing about UV sterilizers is that their efficiency is based on contact time with the UV light. Really good sterilizers have slow flow because that increases the water's contact time with the UV light.

Like mentioned earlier, I would just buy some tubing, split the output with some ball valves and bring a line directly back to your tank. The extra tubing may be a hassle but you need to decide if you'd rather have extra outputs or extra slow filtration.
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post #7 of 11 (permalink) Old 03-03-2012, 03:23 AM
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Any CO2 diffusing method?

I've always wonder if you can combine CO2 & UV into one unit.


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post #8 of 11 (permalink) Old 03-03-2012, 03:31 AM Thread Starter
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I had the uv on my pond.Its way overkill,but its free.My concern is the slower fitration to tank.
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post #9 of 11 (permalink) Old 03-03-2012, 04:22 AM
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If you're not worried about heat rise from an extra pump, I'd plumb that unit separately from your filter.
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post #10 of 11 (permalink) Old 03-03-2012, 12:23 PM
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EHH.. the look like ace hardware barbs.. i've had much better luck with slightly oversixed barbs from HD
3/4 inch barbs have 5/8 I.D.
5/8 barbs have roughly 1/2 inch I.D. so if ur using 5/8 i.d tubing grab a 3/4 barb. vaseline it and shove the tubing on..

i don't believe this is ur true flow issue. but i will help

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post #11 of 11 (permalink) Old 03-03-2012, 01:09 PM
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Quote:
Originally Posted by HD Blazingwolf View Post
EHH.. the look like ace hardware barbs.. i've had much better luck with slightly oversixed barbs from HD
3/4 inch barbs have 5/8 I.D.
5/8 barbs have roughly 1/2 inch I.D. so if ur using 5/8 i.d tubing grab a 3/4 barb. vaseline it and shove the tubing on..

i don't believe this is ur true flow issue. but i will help
I agree, I'd get rid of the 90's which also restrict flow quite a bit and check the diameter on the fittings. Sometimes you can find a fitting that has the same barb size with a bigger inside diameter, though it takes a bit of looking. In the mean time, the 405 is rated for 100 gallons so even with half flow you should be fine with biological filtration, assuming you have it full of media. Mechanical filtration is another thing but water changes can do a pretty good job there anyway.
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