What to do if there is scum ring around my CalderaSpas Hot Tub?
- JJamie HolmesSep 12, 2025
An organic buildup or scum ring around your CalderaSpas Hot Tub is often caused by bacteria or algae growth. To resolve this, shock the spa with sanitizer. If the problem is visible or persistent, drain, clean, and refill the spa. Another cause is the buildup of oils and dirt. Wipe off the scum with a clean rag. If the buildup is severe, drain the spa, use a spa surface and tile cleaner to remove the scum, and then refill the spa.









