When an effect produces mana, that mana adopts a player’s mana share. After that, it can be utilized to fund spells and capabilities. Mana can only be properly used as soon as, whenever mana can be used to cast a spell it's taken out of the mana pool, no further designed for the player to utilize. Each player's mana pool empties at the end of each step of the process and phase.
Before secret 2010, when mana remains in the mana share at the conclusion of the ball player's period, that player would experience mana burn. Said player subtracts one life per mana within their mana share. Aided by the introduction of secret 2010, mana burn ended up being removed, and mana now drained after each step. This means the mana share empties at the end of the step with no penalty.
One of the few cards that could avoid the mana share from draining is Upwelling. Upwelling's text says that "Mana swimming pools cannot bare as measures and phases end." What this means is the mana in each people' share at the conclusion of each step will carry over to a higher action. If you have at the end of your end period, then you'll possess two green mana at the beginning of your opponent's maintenance.