Place your hydroponic base in a location that receives plenty of sun, is reasonably safe from disturbance by pets and wild animals in search of a drink, and is near an electrical outlet. Plug in the plastic hoses that connect the hydroponic base to the circulation pump, and then connect them to each other, if there is more than one in your celery garden.
Lay plastic mesh across the top of the base, and tie it down with plastic or wire ties. Lay perlite atop the mesh.
Place celery seeds into the perlite every 2 or 3 inches.
Mix the nutrient solution with water as directed by the manufacturer. Pour this into the system, fill the base, and switch on the circulatory pump.
Monitor your celery, and add water as necessary to compensate for evaporation. The roots should start to grow from the perlite and into the water beneath after two to three weeks, and the celery stalks should be ready to harvest after about four months.