This is the lowest priced solar oxygenator in the UK. However, don\'t be fooled by the low price tag as this solar air pump set includes a top class solar panel which will produce a maximum air flow of 100 litres per hour. Be quick - this item always sells out! Please note that this item works in direct sunlight only. If you want your solar pump to work when conditions aren\'t sunny then we have a leading range of battery-back up solar oxygenators to choose from.