Originally Posted by
SantaMonica
Before making it bigger, make sure you have the roughest screen and the strongest wattage T5H0 bulbs possible. A SM100 type scrubber can keep nutrients zero if you feed 10 cubes a day (with no waterchanges or other filters).
If you need more power, a 36" screen is no problem. It does not matter how long the pipe/slot is, if the slot is 1/8" wide for a single canvas layer, and 35 gph per inch. The whole slot will flow. Longer pipes/slots/bulbs are more efficient than shorter ones, but are harder to clean in the sink unless you cut it in half like I do. T5HO bulbs lose 3" on each end; that's 6" out of an 18" bulb.