These modifiers all refer to how often a specific type of Flask in Path of Exile can be used. Here’s a breakdown of each term:
Life Flasks: These flasks replenish your character’s health points (HP) when used.
Mana Flasks: These flasks refill your character’s mana points used to cast skills.
Utility Flasks: These flasks provide various temporary effects for your character, such as increased movement speed, invisibility, or damage buffs.
gain (0–3) Charges every 3 seconds: This part defines how often the flask regains its charges for use. It means the flask can gain between 0 and 3 charges every 3 seconds.
every 3 seconds: This specifies the interval at which the flask checks for a charge gain. Regardless of how many charges it gains (0-3), this check happens every 3 seconds.
In simpler terms, these modifiers affect how quickly you can use a specific type of flask again. The more charges a flask gains every 3 seconds, the faster it becomes available for use.