I've been running it for three weeks now and as far as I can see the only time to be aware of is when you decide to clean the sleeve. which reminds me... if you have this spliced into the output of a cannister filter heres a tip... I have mine mounted so that the power cord and bulb mount screws into the bottom, when it comes time to clean the quartz sleeve place a big bucket underneath and carefully unscrew the bulb, set that safely aside and now pull the sleeve out with a little twist, water will now drain into the bucket. Better I think than having to remove all the connections.