Easy to use - a few quick shakes to prime it and 
you're down
Fast - empties the average spa in just over 
30 minutes
Safe - requires no electricity, no pumps and 
no motors
10' hose
Flow rate: 10 to 12 gallons per minute 
(about 40 liters per minute)
don't clog
Can be used to drain any underground water source!
Works for spas, swimming pools, pool covers, 
ponds, wading pools, etc.