Review on GKM9W Internal UV Power Head & Two Pack Replacement Sponge Combo for Maximum Filtration - 3 Items by Bill Ramani

The water in my 75 gallon tank would be so green you couldn't see the back. After 5 days of continuous use, it became crystal clear. It's never been so clear. I know it's rated for 60 gallons but figured why not try it. I'm glad I did this because it made my aquarium look beautiful. The only improvement I could recommend is better suction into the tank. I have a turtle and she loves moving objects around on the glass. But most people probably don't have a turtle lol.