Smartmixer has different types of mixing strategies as defined by the pools below.

Standard Pool:
Traditional and offers the basic type of mixing, where we mix your funds with incoming funds from other clients.
Smart Pool:
This pool uses three different sources of coins to cleanse your coins. We use parts of huge mixing amounts of the Standard Pool, private reserves of Smartmixer and funds from investors.
Stealth Pool:
The Stealth Pool isn't related in any way to coins of the Standard Pool. Instead, it relies only on reserves of Smartmixer and Coins from Investors. It is the safest method to mix your coins.