At the start of each Clan War League Event, the Clan Leader will add (usually) every member of the clan to the CWL Pool. This group can include up to 50 members, so we usually include everyone. Being included in the Pool means that you will receive league medals based on how well the clan does in the league. These medals can be used to buy special items (such as magic hammers) in the League Shop. These medals are awarded after the CWL ends.
During the preparation day for each war, the Clan Leader will assign 15 or 30 members to the CWL Roster (usually 15). These are the players who will actually attack or participate in the war. These players earn additional league medals for each star they earn when attacking during a CWL war.
Because of the way Supercell designed Clan War Leagues, it is essential that the 15 or 30 members selected to be in our Roster for each war are our HIGHEST-LEVEL players. Otherwise, we will be less likely to win. Not winning results in fewer medals for everyone.
We realize that this means that a significant portion of our clan members will not have the opportunity to actively participate in Clan War Leagues, but there is nothing we can do to completely correct this.
However, when two or more players are pretty much equal in war base strength, troop levels, and attack skill, we will do our best to provide opportunities for these players to swap in and out of the roster, giving as many as possible the chance to participate, as long as it does not hurt the clan's chances to win.
To those who cannot participate, we hope that you appreciate our efforts and recognize that you will earn league medals essentially without having to do anything in Clan War Leagues. While it's not as many as you would earn by participating on the active roster, it's still a pretty sweet deal!