diff --git a/blacklist.sh b/blacklist.sh
index daaf4dd..2d91a1a 100644
--- a/blacklist.sh
+++ b/blacklist.sh
@@ -26,7 +26,7 @@ if [ -z "$(which curl)" ]; then
 fi
 
 # create main blocklists chain
-if ! iptables -L ${blocklist_chain_name}; then iptables -N ${blocklist_chain_name}; fi
+if ! iptables -L | grep -q "Chain ${blocklist_chain_name}"; then iptables -N ${blocklist_chain_name}; fi
 
 # inject references to blocklist in the beginning of input and forward chains
 if ! iptables -L INPUT|grep -q ${blocklist_chain_name}; then
@@ -42,14 +42,16 @@ for url in $urls; do
     tmp=$(mktemp)
     tmp2=$(mktemp)
     set_name=$(basename $url)
-    curl --compressed -k "$url" >"$tmp"
+    curl -s --compressed -k "$url" >"$tmp"
     sort -u <"$tmp" | egrep "^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$" >"$tmp2"
     ipset -! create ${set_name} hash:net
     while read line; do
-        ipset add ${set_name} "$line"
+        ipset -! add ${set_name} "$line"
     done <"$tmp2"
     iptables -A ${blocklist_chain_name} -m set --match-set "${set_name}" src,dst -m limit --limit 10/minute -j LOG --log-prefix "BLOCK ${set_name} "
     iptables -A ${blocklist_chain_name} -m set --match-set "${set_name}" src,dst -j DROP
     echo ${set_name} $(ipset list ${set_name} | wc -l)
+    rm "$tmp" "$tmp2"
 done
 
+