The smart solar day function oxygenator 2 airstone air pump is suitable for small to medium sized ponds up to 5000 litres complete with two air stones it oxygenates pond water in sunny weather when oxygen levels are depleted r it is particularly suitable for ponds with no oxygenating plants provides more oxygenation in hotter sunnier conditions when it is needed most powered by a separate solar panel supplied r r 10ft 3m cable to solar panel r no wiring simply install and enjo