Step-by-Step Guide to Optimal Equalizing for Freedivers and Scuba Divers

Eric Fattah first wrote the “Frenzel Fattah Equalizing Document” to explain the Frenzel technique and his strategies for equalizing well below residual lung volume (80m+). Since it was made available on the internet, at least ten thousand people have benefited from his guide to Frenzel and mouth-fill equalizing.

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