One thing about UV is the costs vary a lot, so buy carefully.
I use a Coralife Turbo Twist, and all I have to do is replace the bulb once a year for $60.
But on some you have to replace the quartz sleeve as well, pushing the yearly replacement cost up around $150-200, which is what I paid for my whole 18w sterilizer.
Some of the fancy models also have some quick cleaning gizmos, but my Turbo Twist does not, then again there is no need, when I replace my bulb, there has never been anything to clean inside whatsoever, no green slime algae, no coralline, nothing.
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