There are two types of drain systems. One is the floor drain system which uses gravity to drain the water directly into the floor from each spa. The other is the power drain pump system which will be used to drain out water to the drain pipe above the floor (app. up to 3” to 6” above ground level). Note: if you need a discharge pump, please let Beauty Spa Expo, Inc. know before ordering. A discharge pump is not included with a standard purchase.