DAN's equipment checks include tears, straps, buckles, valves, inflators, dump valves, regulator leaks, computer power and hose condition. Its maintenance guidance says regulators should be overhauled annually or according to the manufacturer's instructions. Cylinders have separate visual and hydrostatic testing requirements. Local rules, manufacturer instructions and the competent technician's advice take priority over a generic calendar.
Review the setup whenever your course, body, location or dive style changes. A new exposure suit can change weighting and trim. A different BCD can change hose reach. A computer with unfamiliar menus can add task load. Before using new equipment on an important trip, ask for an orientation. Practise the controls in an appropriate supervised setting.
After each period of ownership, ask three questions: Did I use it often enough? Did it remain comfortable? Can I keep it serviced? If the answer is no, selling or returning to rental may be wiser than adding more equipment. A compact, well-understood setup is a successful outcome, even with fewer items than the original wish list.