This requires a lot of practice, but some divers can learn to control those muscles and hold their tubes open for continuous equalization. Practice Makes Perfect Divers who experience difficulty equalizing may find it helpful to master several techniques. Many are difficult until practiced repeatedly, but this is one scuba skill you can practice anywhere. Try practicing in front of a mirror so you can watch your throat muscles. When To Equalize Sooner, and more often, than you might think.
Most authorities recommend equalizing every two feet of descent.
At a fairly slow descent rate of 60 feet per minute, that's an equalization every two seconds. Many divers descend much faster and should be equalizing constantly. For example, a descent of six feet from the surface will compress your middle ear space by 20 percent and produce pain. But from 30 feet you'd have to descend another 12.5 feet to get the same 20 percent compression. When you reach your maximum depth, equalize again.