Hi, Im new to owning a hot tub and the used one I bought is a eagle spa and I think they are out of business, anyway i do not have an owners manual and the eletronics are made by spabuilders the pac is a mod. sc-mp-p122-01-LS ID# 3-72-7025 the control is a K-19 . My question is why does the pump run periodically even when it is not heating. Is there some kind of automatic cycle for filtering ? It runs a lot and if thats the case how can I change it. Im afraid to look at my electric bill. Any info or ideas would be greatly appreciated. O and where can I get a users manual. Thanks in advance