Commercial pools, condominium pools, and apartment pools are required by law to have signs stating the rules and regulations. Active Sign Shop manufactures custom pool signage that is made to last outdoors for years. Many pool signs are made using corrugated plastic that typically falls apart within one year. Aluminum does not fall apart or rust so you don't have to replace the sign every year.
Above image: Custom printed graphics applied to aluminum pool sign in West Covina, California. Sign made using .040 aluminum sheeting, with printed vinyl face with a protective UV lamination for outdoor durability