We could probably have a thread dedicated to SM's crazy statements. ------ A few features of the SURF4 provide real usefulness and are available on no other algae scrubber except the SURF2. First, the enclosed growth compartment increases the dwell time of the water and bubbles inside the unit so that they rub the algae many times before leaving the compartment. This actually reduces nutrients (nitrate, phosphate) to a level lower than the outside water, which allows greener growth to occur sooner (lower nutrients grow greener algae) inside the unit, especially in high-nutrient aquarium or pond water. In other words, the SURF4 creates a lower-nutrient ecosystem inside itself which is different from the rest of the outside water. Also, the position of the air bubble inlets (below the growth) causes the bubbles to flow through the growth no matter how thick the growth gets. This is in contrast to waterfall scrubbers which mostly flow water on the outside of the growth, leaving the inner layers of growth without flow. Green Grabber surfaces are so good at grabbing algae and letting it grow, that if you have high nitrate and phosphate you may start seeing tiny growth spots within hours instead of days. And the white color of the Green-Grabber surface reflects as much light as possible, allowing lots of light to reflect back to the algae. The number of gallons or liters of water in your tank or sump does not matter. ------- There's plenty more of these gems on his website and forum.