What are the minimum and maximum pump ratings that can be used with the SCWD? The SCWD can be run off a pump or power head at as low as 50 gallons per hour, and can be used with pump applications up to 1400 gallons and hour. Keep in mind that at fifty gallons an hour the switching response is very slow, and at 1400 gallons an hour the switching response is quite rapid. Är Littel giant och IWAKI pumpar samma pump så finns det manual på denna sida http://iwaki-pumpar.com/Pumpar/?source=overture http://www.iwaki.se/log/PUMPS/2/Instruction/all/md_ins.pdf