Ok, so I retroactively lied, I’ve now joined the affiliate program.

Sunflair Water Pasteurization Indicator (WAPI): https://amzn.to/3Qz4V9f

Water Treatment Series by GearSkeptic that I mentioned: https://www.youtube.com/watch?v=rIMeq0c7rJM&list=PLEu_UfyDKJALgbrNEJ5wpuxadz7uM5hEi