Prevents ponds of up to 30 m from freezing over prevents the complete freezing of your garden pond in this way toxic fumes which form under a closed ice cover can escape and the pond water is still supplied with oxygen in combination with the oxygen pump oxy 100 your pond will have additional oxygen technical specifications diameter 25 cm cable length 12 m 10 m ventilation tube power 230 v water flow rate 100 l min includes aeration pump 230 v 2 5 w 10 m air hose with outfl