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I currently use a Gamma UV in-line. One of the considerations to make sure of when you purchase a UV - is dwell time - the time that the water passes through the sterilizer the longer the Dwell time the more UV that the water recieves. Depending what you read - UV's can be used for alage control and somewhat for pathogens. The higher the wattage and dwell time the better to help with water borne pathogens - again depending on various factors. That is why twists are used to increase dwell time. Wattage of course - and the other is to identify current output of the discharge tube (gph) that you will connect the UV to and match the gph of the uv to the output. For my 55gal i use at least 18w (gamma) and 450-500gph on the output line - so at least a turnover 0f 8 times. The gamma does not have a built in wiper so i clean approx. every 3 months. Secondarily, some uv's on the market appear to be made in China but require the use of a an additional transformer for US ac. To be safe, in my case, i use a name brand with history behind it, even though cost is higher.
Sorry to be long in the reply, and not to tell you anything you already know, hope this helps.
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