I just cleaned my Circupool SWG for the first time. The "cleaning" light on the unit was not on, but the housing is see through and the plates and (particularly) the terminals to the base were pretty gunked up. Not a big deal...just scraped the scale off and blasted with the garden hose. Took about 15 minutes as the "scale" was very soft (mushy).
My question to you SWG owners is, does the scaling reduce the efficiency of the unit? Have not noticed any increased chlorine production since the cleaning.