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Hello, I said one thing wrong in the video, tank water is category 5, existing tanks are worked on according to category 4, so the explanation is better. The topic is very complex, please forgive the error, we will work as described in the video. :) The video is about drinking water protection when drawing fire water. We talk about the system separator, the free tank inlet, the water categories and the DBV. We are the fire service and we in particular should protect drinking water more than anything else. I explain everything important in the video. You can find further information on the topic here on the page where everything is explained again. You can also download information free of charge further down. https://www.dvgw.de/themen/wasser/net... You can also use the information for fire service training and machinist training. MkG Scotty You can support me and the channel here: Amazon Wishlist: https://www.amazon.de/hz/wishlist/ls/... PayPal https://www.paypal.com/donate/?cmd=_s... Become a channel member: / @scottysmaschinistenchannel1465 -- Channel info---------------- I am a machinist instructor at a professional fire department. My videos are mainly about water-carrying fittings (jet pipes, pressure relief valves, system separators, monitors, etc.), fire pumps, pressures and everything you need as a fire pump machinist on fire duty. Due to my experience in this area, I would like to pass on my specialist knowledge through my videos. Here I am giving my personal opinion; however, I am generally open to constructive criticism. You are welcome to contact me at any time via e-mail. E-mail: [email protected] With friendly greetings, Scotty --Social Media -------------------- Facebook: / scottys-masc. . Instagram: / scottys_mas. . Source music: www.frametraxx.de