This article gives a summary of the professional contents-oriented reasons underlying the choice of the depth of training pools. The depth required for the treatment of a patient depends on the purpose of the therapy and the methods used. The immersion depths required for initiating therapeutic effects on the posture and motion systems and creating cardiovascular changes are stated below. A number of hydrotherapy methods will be discussed in relation to the required depth. Several
alternatives for meeting the existing requirements with regard to an adequate water depth in an optimal way will be considered.