UV light installation advice needed...

[alvchong]

i just bot a jebo UV 9w, again, this china products has no instruction (or the LFS didn't put in the box).

guys, where should i installed to? input or output of the canister filer?
any reason not to install input or output? pls advice...

[StanChung]

Logically, better to put in output as the filter filters some of the dirt so it does not dirty the insides of the UVS.

[BFG]

I agree but personally have no experience of using such item. Also, how long do you intend to use them, sporadically or 24/7 ?

[StanChung]

For myself it's lights on period. 8 hours. Otherwise it's one more appliance to pay electricity for!

[ankank]

I agree but personally have no experience of using such item. Also, how long do you intend to use them, sporadically or 24/7 ?

I also don't have any personal experience with them. But one can find numerous reports stating that UV lamps are quite sensible to switching them on and off, seriously reducing their lifetime.

[dickoh]

Logically, better to put in output as the filter filters some of the dirt so it does not dirty the insides of the UVS.

My personal experience is to put them on the output flow as described by standoyo, the other reason is that you still want to keep all the good bacteria in the filters. So the config is
tank - inflow - canister - outflow - UV - tank
You may also want to watch the flow rate of the water thru the UV tube, as too fast a water flow, the UV light will not be able to do its work probably.

[alvchong]

a lot of pple suggest to monitor the water flow rate...
how do i know?

[StanChung]

You can do a little test after you've plugged it all in by testing how quickly the outflow of your canister filter fills a known volume bottle.
After you've done the math and figured out the gallons/liters per hour.

Then compare it with the UV manufacturer's recommended flowrate.