HeatWave Spa Drain and Vacuum Draining your Spa has never been easier with the HeatWave Spa Drain and Vacuum. Submerge the vacuum tube below the water level. Make sure the discharge hose is positioned on the ground and away from the user. Keeping the vacuum tube under the water, pump it up and down until water starts to flow out of the discharge hose. Pump several more times for a faster flow. As the spa drains, move the vacuum tube around the tub to pick up any debris. As the water level lowers, hold the vacuum tube straight so it is flush with the floor of the spa. This will ensure that all the water is completely drained from the tub. As simple as that you can drain your spa with ease.