This is a powerful little pump but with certain limitations and inevitable costly add-ons. The pump works best in deep water. In shallow lying water ( which is what I bought it for) it does not have sufficient vacuum, and the weird floatation on/off switch has a mind of its own. Also the extra hoses needed are ridiculously costly and you cannot do without them. Do not buy the flat hose alone as I was advised to do by B&Q staff, it just kinks all the time.