Once you provide liquidity, your tokens are exchanged and held by the Balancer Pool contract. You will then receive Balancer Pool Tokens (BPT - tokens representing your stake in the pool) in exchange for your ERC-20 tokens.

You can remove your liquidity at any time, this action converts your BPTs with the tokens belonging to the pool in which you participated.

When you remove your share from the pool, it is not guaranteed (or even expected) that you will receive exactly the same number of tokens as you originally provided.

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