well as we are getting deep into springtime here, the blanket weed is booming, most of it in the pond i just pull out with my hand, but in the bio/veggie filter the blanket weed has formed well a blanket all over the surface of the stone chippings, and is showing to be very effective at filtering the water, as a result i have never seen my pond water so crystal clear since i first filled it, hoooray for blanket weed,