09-19-2006, 07:00 PM
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UV or ultraviolet is best used to allow for the best dwell time (amount of time the water makes contact with the light). Specific UVs have a manufacturer rating regarding the dwell time, depending on the specific need.
If you have an Eheim Pro II 2126 canister filter, which has a manufacturer flow rate of 250 GPH. According to Coralife's website
, the instructions (page 5) state the following...
| 9 watt - 55 GPH to eliminate parasites, 121 GPH to eliminate algae, 253 to eliminate bacteria |
18 watt - 110 GPH to eliminate parasites, 240 GPH to eliminate algae, 500 to eliminate bacteria
36 watt - 290 GPH to eliminate parasites, 680 GPH to eliminate algae, 1550 to eliminate bacteria
You want the best dwell time (length of time the water runs through the UV lamp) for your filter. So if your main purpose is to eliminate algae, then the 18 watt is sufficient if connected to the Eheim Pro II 2026 filter. Otherwise, you can connect a bigger UV, such as the 36 watt to the canister OR connect to a seperate powerhead to the UV filter.
I also use a UV and connect it to a powerhead, so I can easily transfer the UV to any tank having problems with algae or if I want to eleminate parasites.