This powerful pond pump can create a large waterfall (maximum head 4.5 metres) or power a filter system for a pond up to 21,200 litres. It handles solids up to 8mm and comes with a 3 year guarantee. Laguna are one of the top brands in the UK and the Max-Flo pumps have proven reliable over many years. Their durability is reflected in the 3 year manufacturers warranty you receive with this item. Smart Pump Technology The pump you will receive is the new improved version featuring smart pump technology (SPT). This feature means the pond motor has \'intelligence\' in that it constantly monitors the working conditions of the pump and adjusts motor performance accordingly - this improves pump performance and economy.