UV flow rate

[RandyC]

Not to gotcha you, but if it's two pumps each putting out 300gph or a single 600gph pump going in parallel to two UVs, that's the same no? Both are just different mechanical configurations of the water routing.

RE the sizing and what not, maybe I'm misinterpreting the original post, but I assumed it's two equal sized and the only difference is plumbing configuration. Everything held fixed my vibe being both configurations seen equivalent. As long as you don't do crazy town and do 2-600gph separate pumps versus a single 600gph. That definitely would be worse, because total dwell time is halved.

Said differently, ignoring some details, I'm proposing these seem equivalent (600gph being arbitrary):

1. A serial, setup with 2 UV and a 600gph pump
2. A single 600gph pump connected tee-ed to 2 parallel UVs
3. Two separate 300gph pumps powering 2 separate UVs

I originally thought the double 300gph would be better, but I don't think the math works out that way. Given that I think the answer is "doesn't matter", and whichever is easier to plumb and do maintenance on.

yes, in theory all three of those are the same from a dwell time perspective. Having two in parallel could added unnecessary (potentially small) complications.

However:

1. maintenance is not the same
2. Need to ensure that the correct flow for both UV units vs. one if done in series
3. Chance (though probably small) of having just UV treated water immediately go into the other UV unit vs "new water" lowering turnover rate

 

[JVU]

Not to gotcha you, but if it's two pumps each putting out 300gph or a single 600gph pump going in parallel to two UVs, that's the same no? Both are just different mechanical configurations of the water routing.

RE the sizing and what not, maybe I'm misinterpreting the original post, but I assumed it's two equal sized and the only difference is plumbing configuration. Everything held fixed my vibe being both configurations seen equivalent. As long as you don't do crazy town and do 2-600gph separate pumps versus a single 600gph. That definitely would be worse, because total dwell time is halved.

Said differently, ignoring some details, I'm proposing these seem equivalent (600gph being arbitrary):

1. A serial, setup with 2 UV and a 600gph pump
2. A single 600gph pump connected tee-ed to 2 parallel UVs
3. Two separate 300gph pumps powering 2 separate UVs

I originally thought the double 300gph would be better, but I don't think the math works out that way. Given that I think the answer is "doesn't matter", and whichever is easier to plumb and do maintenance on.

Don’t worry you aren’t gotcha-ing me, because I think you are saying the same thing I started with, that they are functionally about the same.

Since you were getting into it with diagrams and math and stuff I was just pointing out that having 2 units in 1 system is different than 2 systems if you want to be a bit picky because of mixing effects between systems. But for the purposes of killing stuff with UV they are functionally about the same.

Also just practically speaking I agree with you that keeping it simple or having it work with existing plumbing will be more important to an individual reefer.

 

[MichaelB]

One of the best studies and longest Ive read on Cryptocaryon irritans ( marine ich) a while back was by Colorni and Burgess 1997 which was an extremely lengthy phd research paper! I could not find that research paper but this article in the link sources some of their studies as well as other research papers on the subject.
Whats notable is fish can be asymptomatic of marine ich acting like carriers with no symptoms for 6 month or so when a new clean fish is added that one can develop ich immediately . They hatch mostly at night from the sand and rocks while most fish are laying their sleeping so easy prey..They do talk a bit regarding Uv
Anyhow good read enjoy!

FA164/FA164: Cryptocaryon irritans Infections (Marine White Spot Disease) in Fish

University of Florida, Institute of Food and Agricultural Sciences Extension outreach is a partnership between state, federal, and county governments to provide scientific knowledge and expertise to the public. The University of Florida (UF), together with Florida A&M University (FAMU)...

edis.ifas.ufl.edu

Good information. Also understandabe being a plus.