diff --git a/gravity-adv.sh b/gravity-adv.sh
index 4b62817e..c6a2ba62 100755
--- a/gravity-adv.sh
+++ b/gravity-adv.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# The Pi-hole now blocks over 120,000 ad domains
+# The Pi-hole now blocks over 90,000 ad domains
 # Address to send ads to (the RPi)
 piholeIP="127.0.0.1"
 # Optionally, uncomment to automatically detect the local IP address.
@@ -7,60 +7,76 @@ piholeIP="127.0.0.1"
 
 # Config file to hold URL rules
 eventHorizion="/etc/dnsmasq.d/adList.conf"
-blacklist=/etc/pihole/blacklist.txt
-whitelist=/etc/pihole/whitelist.txt
+piholeDir='/etc/pihole/'     
+
+blacklist=$piholeDir'blacklist.txt'
+whitelist=$piholeDir'whitelist.txt'
 
 # Create the pihole resource directory if it doesn't exist.  Future files will be stored here
-if [[ -d /etc/pihole/ ]];then
+if [[ -d $piholeDir ]];then
 	:
 else
 	echo "Forming pihole directory..."
-	sudo mkdir /etc/pihole
+	sudo mkdir $piholeDir
 fi
 
-echo "Getting yoyo ad list..." # Approximately 2452 domains at the time of writing
-curl -s -d mimetype=plaintext -d hostformat=unixhosts http://pgl.yoyo.org/adservers/serverlist.php? | sort > /tmp/matter.txt
-echo "Getting winhelp2002 ad list..." # 12985 domains
-curl -s http://winhelp2002.mvps.org/hosts.txt | grep -v "#" | grep -v "127.0.0.1" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | sort >> /tmp/matter.txt
-echo "Getting adaway ad list..." # 445 domains
-curl -s https://adaway.org/hosts.txt | grep -v "#" | grep -v "::1" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' | sort >> /tmp/matter.txt
-echo "Getting hosts-file ad list..." # 28050 domains
-curl -s http://hosts-file.net/.%5Cad_servers.txt | grep -v "#" | grep -v "::1" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' | sort >> /tmp/matter.txt
-echo "Getting malwaredomainlist ad list..." # 1352 domains
-curl -s http://www.malwaredomainlist.com/hostslist/hosts.txt | grep -v "#" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $3}' | grep -v '^\\' | grep -v '\\$' | sort >> /tmp/matter.txt
-echo "Getting adblock.gjtech ad list..." # 696 domains
-curl -s http://adblock.gjtech.net/?format=unix-hosts | grep -v "#" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' | sort >> /tmp/matter.txt
-echo "Getting someone who cares ad list..." # 10600
-curl -s http://someonewhocares.org/hosts/hosts | grep -v "#" | sed '/^$/d' | sed 's/\ /\\ /g' | grep -v '^\\' | grep -v '\\$' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' | sort >> /tmp/matter.txt
-echo "Getting Mother of All Ad Blocks list..." # 102168 domains!! Thanks Kacy
-curl -A 'Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0' -e http://forum.xda-developers.com/ http://adblock.mahakala.is/ | grep -v "#" | awk '{print $2}' | sort >> /tmp/matter.txt
+tmpDir='/tmp/'    
+tmpAdList=$tmpDir'matter.pihole.txt'
+tmpConf=$tmpDir'andLight.pihole.txt'
+tmpWhiteList=$tmpDir'yang.pihole.txt'
+tmpBlackList=$tmpDir'yin.pihole.txt'
 
-# Add entries from the local blacklist file if it exists in /etc/pihole directory
+echo "Getting yoyo ad list..." # Approximately 2452 domains at the time of writing
+curl -s -d mimetype=plaintext -d hostformat=unixhosts http://pgl.yoyo.org/adservers/serverlist.php? | sort > $tmpAdList
+echo "Getting winhelp2002 ad list..." # 12985 domains
+curl -s http://winhelp2002.mvps.org/hosts.txt | grep -v "#" | grep -v "127.0.0.1" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' >> $tmpAdList
+echo "Getting adaway ad list..." # 445 domains
+curl -s https://adaway.org/hosts.txt | grep -v "#" | grep -v "::1" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' >> $tmpAdList
+echo "Getting hosts-file ad list..." # 28050 domains
+curl -s http://hosts-file.net/.%5Cad_servers.txt | grep -v "#" | grep -v "::1" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' >> $tmpAdList
+echo "Getting malwaredomainlist ad list..." # 1352 domains
+curl -s http://www.malwaredomainlist.com/hostslist/hosts.txt | grep -v "#" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $3}' | grep -v '^\\' | grep -v '\\$'  >> $tmpAdList
+echo "Getting adblock.gjtech ad list..." # 696 domains
+curl -s http://adblock.gjtech.net/?format=unix-hosts | grep -v "#" | sed '/^$/d' | sed 's/\ /\\ /g' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' >> $tmpAdList
+echo "Getting someone who cares ad list..." # 10600
+curl -s http://someonewhocares.org/hosts/hosts | grep -v "#" | sed '/^$/d' | sed 's/\ /\\ /g' | grep -v '^\\' | grep -v '\\$' | awk '{print $2}' | grep -v '^\\' | grep -v '\\$' >> $tmpAdList
+echo "Getting Mother of All Ad Blocks list..." # 102168 domains!! Thanks Kacy
+curl -A 'Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0' -e http://forum.xda-developers.com/ http://adblock.mahakala.is/ | grep -v "#" | awk '{print $2}' >> $tmpAdList
+
+# Add entries from the local blacklist file if it exists in $piholeDir directory
+echo -n "" > $tmpBlackList
 if [[ -f $blacklist ]];then
-        echo "Getting the local blacklist from /etc/pihole directory"
-        cat $blacklist >> /tmp/matter.txt
-else
-        :
+    echo "Getting the local blacklist from $piholeDir directory"
+    awk -F'[# \t]' 'NF>0&&$1!="" {print $1}' $blacklist > $tmpBlackList
+    cat $tmpBlackList >> $tmpAdList
+fi
+
+# Clean-up entries from the local whitelist file if it exists in $piholeDir directory
+echo -n "^$" > $tmpWhiteList
+if [[ -f $whitelist ]];then
+    echo "Getting the local whitelist from $piholeDir directory"
+    awk -F'[# \t]' 'NF>0&&$1!="" {print $1"$"}' $whitelist > $tmpWhiteList
 fi
 
 # Sort the aggregated results and remove any duplicates
-# Remove entries from the whitelist file if it exists at the root of the current user's home folder
-if [[ -f $whitelist ]];then
-	echo "Removing duplicates, whitelisting, and formatting the list of domains..."
-	cat /tmp/matter.txt | sed $'s/\r$//' | sort | uniq | sed '/^$/d' | grep -v -x -f $whitelist | awk -v "IP=$piholeIP" '{sub(/\r$/,""); print "address=/"$0"/"IP}' > /tmp/andLight.txt
-	numberOfSitesWhitelisted=$(cat $whitelist | wc -l | sed 's/^[ \t]*//')
-	echo "$numberOfSitesWhitelisted domains whitelisted."
-else
-	echo "Removing duplicates and formatting the list of domains..."
-	cat /tmp/matter.txt | sed $'s/\r$//' | sort | uniq | sed '/^$/d' | awk -v "IP=$piholeIP" '{sub(/\r$/,""); print "address=/"$0"/"IP}' > /tmp/andLight.txt
-fi
+# Remove entries from the whitelist file if it exists in $piholeDir folder
+echo "Removing duplicates, whitelisting, and formatting the list of domains..."
+grep -vhE "^\s*(#|$)" $tmpAdList| 
+    sed $'s/\r$//'| 
+    awk -F. '{for (i=NF; i>1; --i) printf "%s.",$i;print $1}'| 
+    sort -t'.' -k1,2| uniq |  grep -vwf $tmpWhiteList |
+    awk -F. 'NR!=1&&substr($0,1,length(p))==p {next} {p=$0".";for (i=NF; i>1; --i) printf "%s.",$i;print $1}'| 
+    awk -v "IP=$piholeIP" '{sub(/\r$/,""); print "address=/"$0"/"IP}' > $tmpConf
+numberOfSitesWhitelisted=$(cat $tmpWhiteList | wc -l | sed 's/^[ \t]*//')
+numberOfSitesBlacklisted=$(cat $tmpBlackList | wc -l | sed 's/^[ \t]*//')
+echo "$numberOfSitesWhitelisted domain(s) whitelisted, $numberOfSitesBlacklisted domain(s) blacklisted."
 
 # Count how many domains/whitelists were added so it can be displayed to the user
-numberOfAdsBlocked=$(cat /tmp/andLight.txt | wc -l | sed 's/^[ \t]*//')
+numberOfAdsBlocked=$(cat $tmpConf | wc -l | sed 's/^[ \t]*//')
 echo "$numberOfAdsBlocked ad domains blocked."
 
 # Turn the file into a dnsmasq config file
-sudo mv /tmp/andLight.txt $eventHorizion
+sudo mv $tmpConf $eventHorizion
 
 # Restart DNS
 sudo service dnsmasq restart