Accounts Overview

Existential Deposit
An address is active when it holds a set minimum amount on the Polkadot and Kusama networks, this quantity is called the existential deposit (ED). In Polkadot the ED is currently 1 DOT, while on the Kusama network, it is set at 0.0000333333 KSM.
If wallet funds are lower than the existential deposit amount, the account will be deactivated (reaped) and any remaining funds are destroyed. In order to reactivate it, you must send an amount larger than the existential deposit. However, this will not restore the destroyed funds. 
Further useful information:
If you contribute to crowdloans, make sure that your balance doesn't drop below the existential deposit or that you contribute your entire balance.
If you are staking, do not direct staking rewards to an inactive account. If rewards are less than 1 DOT (0.0000333333 KSM), you will lose them.
If you're sending a transaction that will reduce your balance below the existential deposit, you will be notified with the following message:
You can read more here: https://support.polkadot.network/support/solutions/articles/65000168651-what-is-the-existential-deposit-​

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