average cost to drain pool
1 On average, draining a pool is going to cost anywhere from $1 to $2 per 1,000 gallons. 2  This price is to drain and refill the pool. 3  For example, a 20,000 gallon pool could cost anywhere from $20 to $40.4  However, keep in mind that most water companies will have a delivery fee that is tacked on top of this. On average, 10 to 12 gallons will be drained per minute. 2  Once the pool is drained, itâs important that itâs refilled immediately. 3  A pool will be drained if the TDS (total dissolved solids) exceed 1,500 parts per million. 4  If it exceeds this number, it can be hard to balance the chemicals.