For the swimmingpool to have good water treatment, you have to, in addition to, chemicals and filters, make sure you have a reliable and correct circulation of the water in the pool. We have, under the tab "Downloads", a filter pump caculater, which can help you to choose the right size pool pump and filter. With filter pumps from Kripsol and Badu Speck, you'll find both the classic on/off pool pumps and the new energy saving frequency controlled filter pumps. Those you can set in different speeds, for the time the pool is in use, which means you dont use as much water circulation through the sand filter. When the filter needs to be backwashed, the filter pumps can give extra strong pressure. All together this gives a big saving in water-, chemicals- and the use of electricity.