How long to run UV sterilizer?

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I don’t know. Quite possibly. Parasites require more UV exposure than algae and bacteria.

“based on research involving Ichthyophthirius multifiliis (freshwater “ich”). The recommended UV dose for Ichthyophthirius theronts is 100,000 µWsec/ cm2”.

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Yet in a system with over 720 gallons of water, a flow rate of 450 gph, 96W of UV was able to achieve nearly double that dose rate. Mortality rate decreased from 83 to 0.7 percent.

Nevermind that most (likely all) of the numbers you see bandied about are single pass systems. In a recirculating system, the effectiveness of UV is greatly enhanced. People assume that any organism that doesn't receive a lethal dose in a single pass instantly repairs itself with no energy cost, defying physics. Especially considering the fact that ich only has one life stage that feeds and the remaining stages have to replicate, overcome host defenses, repair damage, and swim around looking for fish using a finite amount of stored energy.

A population of ich under constant pressure from the fishes' immune systems and UV can eventually be eliminated from a system. That's why I can subject my

One of the greatest myths in the hobby is that UV can't be effective against parasites. A vast majority of aquarists believe this and the more widely held a belief is in this hobby the less likely it is to be true. You simply can't go wrong betting against the collective intelligence of aquarists.

Yet in a system with over 720 gallons of water, a flow rate of 450 gph, 96W of UV was able to achieve nearly double that dose rate. Mortality rate decreased from 83 to 0.7 percent.Nevermind that most (likely all) of the numbers you see bandied about are single pass systems. In a recirculating system, the effectiveness of UV is greatly enhanced. People assume that any organism that doesn't receive a lethal dose in a single pass instantly repairs itself with no energy cost, defying physics. Especially considering the fact that ich only has one life stage that feeds and the remaining stages have to replicate, overcome host defenses, repair damage, and swim around looking for fish using a finite amount of stored energy.A population of ich under constant pressure from the fishes' immune systems and UV can eventually be eliminated from a system. That's why I can subject my clown loaches to all kinds of stress (e.g., moving) and they won't get ich.One of the greatest myths in the hobby is that UV can't be effective against parasites. A vast majority of aquarists believe this and the more widely held a belief is in this hobby the less likely it is to be true. You simply can't go wrong betting against the collective intelligence of aquarists.

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