Yes, @mustafa is right. You already have gzip enabled (because of pagespeed as mustafa writes):
root]$ curl -H "Accept-Encoding: gzip" -I
https://pharmaindigital.com/HTTP/1.1 200 OK
Date: Thu, 04 May 2017 06:53:53 GMT
Server: Apache/2.4.25 (CentOS)
X-Content-Type-Options: nosniff
X-XSS-Protection: 1;mode=block
X-Frame-Options: SAMEORIGIN
Access-Control-Allow-Origin: *
X-Supported-By: Kloxo-MR 7.0
Strict-Transport-Security: max-age=2592000; preload
Upgrade: h2
Connection: Upgrade, close
Accept-Ranges: bytes
X-Mod-Pagespeed: 1.11.33.4-0
Cache-Control: max-age=0, no-cache, must-revalidate
Vary: Accept-Encoding,Cookie
Content-Encoding: gzip
Content-Length: 18340
Content-Type: text/html; charset=UTF-8