User talk:Ashfakur Rahman

November 2019
Hello, I'm Serols. I wanted to let you know that I reverted one of your recent contributions —specifically this edit to Drinking water—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help desk. Thanks. Serols (talk) 16:32, 16 November 2019 (UTC)

Please do not add promotional material to Wikipedia, as you did to Lava filter. While objective prose about beliefs, organisations, people, products or services is acceptable, Wikipedia is not a vehicle for soapboxing, advertising or promotion. Thank you.  Velella  Velella Talk 15:20, 19 November 2019 (UTC)