diff --git a/README.md b/README.md
index f3c9345..e821b76 100644
--- a/README.md
+++ b/README.md
@@ -82,7 +82,7 @@ aquatic-crawler --infohash-file   /path/to/info-hash-ipv4.json\
 
         ## Example:
 
-        Filter by image ext ``` --preload-regex '\.(png|gif|jpeg|webp)$' ```
+        Filter by image ext ``` --preload-regex '(png|gif|jpeg|jpg|webp)$' ```
 
         * requires `storage` argument defined
 
@@ -92,6 +92,11 @@ aquatic-crawler --infohash-file   /path/to/info-hash-ipv4.json\
 --socks-proxy-url <SOCKS_PROXY_URL>
         Use `socks5://[username:password@]host:port`
 
+--index-capacity <INDEX_CAPACITY>
+        Estimated info-hash index capacity
+
+        [default: 1000]
+
 -s <SLEEP>
         Crawl loop delay in seconds
 
diff --git a/src/argument.rs b/src/argument.rs
index 41b24a6..c03b5bc 100644
--- a/src/argument.rs
+++ b/src/argument.rs
@@ -66,6 +66,10 @@ pub struct Argument {
     #[arg(long)]
     pub socks_proxy_url: Option<String>,
 
+    /// Estimated info-hash index capacity
+    #[arg(long, default_value_t = 1000)]
+    pub index_capacity: usize,
+
     /// Crawl loop delay in seconds
     #[arg(short, default_value_t = 300)]
     pub sleep: u64,
diff --git a/src/main.rs b/src/main.rs
index e996d15..7d014bc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,7 +13,7 @@ use storage::Storage;
 async fn main() -> Result<()> {
     use clap::Parser;
     use librqbit::{AddTorrent, AddTorrentOptions, AddTorrentResponse, SessionOptions};
-    use std::{num::NonZero, time::Duration};
+    use std::{collections::HashSet, num::NonZero, time::Duration};
 
     // init components
     let arg = argument::Argument::parse();
@@ -41,18 +41,21 @@ async fn main() -> Result<()> {
     // begin
     debug.info("Crawler started");
 
+    // collect processed info hashes to skip on the next cycles
+    let mut index = HashSet::with_capacity(arg.index_capacity);
     loop {
         debug.info("Index queue begin...");
-        let mut total = 0;
         // collect info-hashes from each API channel
         for source in &arg.infohash_file {
-            debug.info(&format!("Handle info-hash source `{source}`..."));
+            debug.info(&format!("Index source `{source}`..."));
             // aquatic server may update the stats at this moment,
             // handle this state manually
             match api::infohashes(source) {
                 Ok(infohashes) => {
-                    total += infohashes.len();
                     for i in infohashes {
+                        if index.contains(&i) {
+                            continue;
+                        }
                         debug.info(&format!("Index `{i}`..."));
                         match session
                             .add_torrent(
@@ -78,33 +81,24 @@ async fn main() -> Result<()> {
                             .await
                         {
                             Ok(r) => match r {
-                                AddTorrentResponse::AlreadyManaged(_, t)
-                                | AddTorrentResponse::Added(_, t) => {
+                                AddTorrentResponse::Added(id, mt) => {
                                     if arg.save_torrents {
-                                        t.with_metadata(|m| {
+                                        mt.with_metadata(|m| {
                                             save_torrent_file(
                                                 &storage,
                                                 &debug,
                                                 &i,
                                                 &m.torrent_bytes,
                                             )
+                                            // @TODO
+                                            // use `r.info` for Memory, SQLite, Manticore and other alternative storage type
                                         })?;
                                     }
-                                    /*tokio::spawn({
-                                        let t = t.clone();
-                                        let d = Duration::from_secs(5);
-                                        async move {
-                                            loop {
-                                                let s = t.stats();
-                                                if s.finished {
-                                                    break;
-                                                }
-                                                debug.info(&format!("{s}..."));
-                                                tokio::time::sleep(d).await;
-                                            }
-                                        }
-                                    });*/
-                                    // @TODO t.wait_until_completed().await?;
+                                    mt.wait_until_completed().await?;
+                                    session
+                                        .delete(librqbit::api::TorrentIdOrHash::Id(id), false)
+                                        .await?;
+                                    index.insert(mt.info_hash().as_string());
                                 }
                                 AddTorrentResponse::ListOnly(r) => {
                                     if arg.save_torrents {
@@ -112,7 +106,9 @@ async fn main() -> Result<()> {
                                     }
                                     // @TODO
                                     // use `r.info` for Memory, SQLite, Manticore and other alternative storage type
+                                    index.insert(r.info_hash.as_string());
                                 }
+                                AddTorrentResponse::AlreadyManaged(..) => panic!(), // unexpected as should be deleted
                             },
                             Err(e) => debug.info(&format!("Torrent handle skipped: `{e}`")),
                         }
@@ -122,7 +118,8 @@ async fn main() -> Result<()> {
             }
         }
         debug.info(&format!(
-            "Index of {total} hashes completed, await {} seconds to continue...",
+            "Index completed, {} total, await {} seconds to continue...",
+            index.len(),
             arg.sleep,
         ));
         std::thread::sleep(Duration::from_secs(arg.sleep));