Then right now immediately after emptying and cleaning I refilled and used an item with benzalkonium chloride which did not foam as much but immediately introduced up a lovely brown ring of gunk round the tub. (Image two). I've given that deduced this is my daughter's bogus tan. In the https://www.profi-poolwelt.de/automatischer-poolsauger-schwimmbadsauger-poolroboter-profi.html