Drain and rinse everything and hose down the. Buckets, flush it all out and shop vac the buckets out. 20ml bleach per gallon of water and refill the system. Reverse your hose lines to the chiller and turn pump on. Let it run for 24 hours and than empty. Refill system with water than flush 1 more time and shop vac out the rest of the water. Unhook the chiller and tilt it over to get the rest of water out. Dont leave chiller tilted just tilt quick enough to get the water out
Your all set till your ready to refill.