Blanketweed is a common pond menace as this invasive weed can make your pond look unsightly and can block up pumps and filters. This is the ultimate permanent cure for blanketweed issues. The Velda T- Tronic introduces copper ions into the pond water to stop the formation of blanketweed and algae. This technology is the same as that used to stop bottled water going green on the supermarket shelves. The unit should be connected into the hose between your pump and filter. A mains power weatherproof control unit is attached to it which can be manipulated to suit your pond\'s conditions. User controls amount of active copper ions released into water via a weatherproof LCD screen. No more temporary fixes with messy treatments!