alarm alarming alert angles appearances authorities authority aware awareness city communicate communication community exterior external height high megaphone megaphones sound volume warning warning-system air-controls amenities bubbling high-volume hot-tub hot-tub-spa hydrotherapeutic-massage hydrotherapy jacuzzi jet-technology jets jetted-whirlpool large-tub low-pressure massage massage-jets outdoor outside pump-system pumps sanitized sanitizing small-pool spa spiraling swirl swirling warm warmed water waterfall whirlpool autumn blue brown circular concrete control controlled distinctive equipment established fall galvinised gray grey heavy-duty industrial inlet leaves marked measure measured outlet pipe piped pipes plumbing plumbing-fittings round rounded rust rusted rusting supplied supply utility valve water-mains water-supply