Metallic connection between the capacitor containers and external cooling water pipes must be prevented by using non-conductive tubing such as a rubber hose. Likewise the water connection between individual capacitors should also be non-conducting because a difference of potential may exist between the capacitor containers. The length of non-conductive tubing required will depend on local conditions such as the resistivity of water at the outlet temperature and the amount of leakage current permitted.

Reasonably clean cooling water must be supplied at any suitable pressure up to 150 psi with a recommended minimum flow of 1 GPM (3.8 Itr/min) per capacitor. The outlet water temperature should not exceed 45°C during continuous operation at rated voltage and frequency. To prevent copper erosion due to high velocity water, the flow should be limited to 1GPM (3.8 lit/min)