AllenF":1uprpskx said:Regular cleaning...
From the sounds of it regular cleaning and a routine replacement (say every 3 years) of pumps is CHEAPER than the possible risks....
How about once a year take’m apart. Scrape nothing! Drop the parts in a small tub of pool acid. Wait until the smoke clears. Rinse, reassemble and reinstall. Unless it's a RIO, trash can it and go rent another before you get electrocuted.