I've had an expansion tank fitted for a long time but recently changed my gravel filter and switched to a canister filter. I ended up getting a bacterial bloom followed by an algal bloom. I had a Coral Life Sterilizer that I hooked up a long time ago. I bought 2 of these lamps. I am attaching before and after photos. Clarity lasted about a week in a 50 gallon tank. Pump about 50 gallons per hour. A fountain pump that I also bought from Revain. A bit cloudy at the end of the week, just a white cloud on the water. I am assuming that not all of the UV treated particles were trapped by the filter. The single dose of water clarifier is used up. Now crystal clear. Bulbs work as described, great price compared to the brand name.
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