Yup, toss some in, let them explode and filter everything with thier roots. Drag them out before they die to a compost pile. But as you know this is not a toss them in and they manage themselves operation. I would not let them take over 1/2 of the ponds surface. I use them a lot. But I compost the long rooted mother plants when they produce babies. The roots just get saturated to a point they do not filter much. Do not let them die and sink.