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In sweet water one kg lift equals one liter of displacement. So: the width times the depth times the height of the foam block should be more or equal to 40.82 liters. (W x D x H >= 40.82). If more then one foam block is used, just add up the individual volumes. I never had any problems checking these rules.

For example: a 15 x 15 cm block of foam that is 1.82 meters long displaces 40.9 liters of water.