How to prevent efflorescence on concrete outdoor chairs?

Efflorescence, the white powdery residue on concrete outdoor chairs, occurs when water-soluble salts rise to the surface. To prevent it, follow these steps:

1. Use Quality Concrete Mix: Opt for low-alkali cement and clean aggregates to minimize salt content.

2. Proper Curing: Ensure adequate curing time (7+ days) to reduce moisture movement.

3. Apply a Sealant: Use a penetrating concrete sealer to block moisture absorption. Reapply every 1-2 years.

4. Control Water Exposure: Keep chairs elevated and avoid prolonged wetness. Cover them during rain.

5. Regular Cleaning: Brush off dirt and rinse with a mild acid solution (vinegar/water) to dissolve early efflorescence.

For existing efflorescence, scrub with a stiff brush and rinse thoroughly. Prevention is key—sealing and proper maintenance will keep your concrete chairs looking pristine.