Place your thumb over the end cap hole, put the Paradise Spa Vac into your spa or pool (debris chamber must be fully submerged in water) release your thumb from the end cap and watch the sand, pennies, and even small pebbles easily enter the clear polycarbonate chamber. When you are finished cleaning, remove the lower cup assembly and empty the contents. Rinse out filter area. It’s that easy! The Paradise’s Spa Vac Filter System traps 99.9% of all debris!