getting the correct amount of oxygen into your pond water is essential for fish pond plants & microbes that help keep your pond water clear clean & free from algae. the solar oxygenator is an ingenious air pump suitable for small to medium sized ponds. like all solar products the brighter the sun the better it works! easy to install no wiring is required & it has no running costs. the solar panel can be placed up to 1.5m (4ft 11ins) away from the oxygenator using the supplied cable & comes with a ground stake.