Spa shell surface around waterline is rough, with white scale deposits.

Safety: Use non-abrasive cleaners approved for acrylic spa shells.

• Step 1 – Lower hardness: If fill water is very hard, consider using a pre-filter or partially draining and refilling with softer water.
• Step 2 – Adjust chemistry: Bring pH and alkalinity into proper range to reduce scaling tendency.
• Step 3 – Clean scale: Gently scrub affected areas with a scale remover and soft cloth or sponge.
• Step 4 – Preventive maintenance: Maintain regular water changes and chemical balance.