Spa shell surface around jets or seats feels rough or sandpaper-like

Safety first: Turn off power and avoid running pumps while scrubbing the shell.

Remove scale:

• Lower water level: Drain water below affected areas.
• Use scale remover: Apply a spa-safe scale remover or diluted white vinegar to the rough areas and let it sit briefly.
• Scrub gently: Use a non-abrasive sponge or soft brush to remove scale. Avoid harsh abrasives that can damage the shell.
• Balance water: Refill and adjust pH, alkalinity, and calcium hardness to recommended levels to prevent recurrence.