Poznań also have clams monitoring system. I was in there several years ago, and I didn't realize that other cities have it too. And it was nice to hear my language in your video.,(reply>), ​@Tadeusz Chinalski I suppose it's probably 'cause Poznań's Aquanet was using this before SYMBIO has been created?,(reply>), Company setting up this monitoring systems is set in Poznań, and its providing SYMBIO devices all over the country. Whats funny Poznań's Aquanet is not using said divice, they have their own bit different solution.