Royal Pool Deck O Seal What is Deck O Seal? Is is the seal between the concrete section that prevents water from seeping between the pool and concrete. We serve Antelope Valley, Santa Clarita Valley and the San Fernando Valley, we do deck of seal installation, repair and repouring, we also do swimming pool cleaning weekly and bi-weekly, Mastic Service, Swimming Pool Hand Rail Installation, Acid Wash, Pressure Wash , Filter Cleaning, Pentair, Hayward and Jandy