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Old 04-17-2011, 03:41 PM   #1
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UV Sterilizer flow rate

I just measured the flow rate through my Aqua Medic 18W UV light, and it's 120liter/hour (approx 30gph), does that seem too slow? My aquarium is 450liters +35 liter sump, total 485liters (125 gallons).

The manufacturer says its suitable for saltwater aquariums 500-1000 liters at a max flow rate of 1000lph (250gph), I would assume that the max flow rate is good for algae, so would about half of that be good for parasites?

I checked other manufacturer's (Turbo Twist) and it seems 18W units are good at 250gph for algae and about 110gph for parasites. Would it be a fair assumption that at my current rate of 30gph, that would be way too slow? I'm concerned that it would take 4 hours for the DT to go through a complete cycle.

I read a recommendation here on this forum, that when sizing the right UV for one's tank, it should be as such that the kill rate allow the entire tank to go through 2 cycles/hour. So I'll need to get a UV light whose kill rate is about 250gph. Turbo Twist says their 36 watt unit's kill rate is 290gph. Turbo Twist doesn't come here, and to play it safe, I'm thinking of ordering a 55 watt and run that at about 250gph.

Your advice is appreciated.

cheers

Wael
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Old 04-17-2011, 05:35 PM   #2
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The 30 gph rate is when the UV was inline after my phosphate reactor which slows down my 2500 lph(625gph) pump. I disconnected the UV and placed it on the smallest pump on the market here (250gph) and I measured 150 gph. That seems faster than the recommended 110 gph. I'm thinking of placing a carbon reactor before the UV to slow it down.

Does the carbon reactor slow down the waterflow as much as the phosphate?
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