There are a number of occasions when it will be necessary to move koi from their current environment into a temporary holding facility. This will occur when cleaning a pond, carrying out a repair, refurbishing or upgrading a system, moving house or isolating individual fish for treatment. The koi keeper will benefit from an up and running quarantine system to receive new purchases. Here the fish can be carefully monitored and undergo a general course of medication against parasites. Such units are ideal for raising fry as a totally controlled environment can be established. Since the well-being of the fish is of paramount importance, careful preparation in advance of any of the above is essential.