Microbe Life Hydroponics Premium Dechlorinator for Hydroponics Gardens, Chlorine and Chloramine Neutralizing Full-Function Water Conditioner for Fruits, Vegetables, and Herbs, 16 Ounces

I didn't start using it until this spring, and I commented almost the same exact thing you did on a different post a couple months back, and another Reddit user shared the knowledge with me! Here's the one I use if you would prefer to purchase something that somebody else already has and can vouch for: https://a.co/d/02cbKgyL 16fl oz treats about 946 gallons of water, and I double checked it is good to use with coco coir as well as soil and hydroponics/aquaponics! For what it's worth, you can boil water for a certain amount of time and speed up the off gassing process. It may not be feasible for most people though. I live in Maine and always have a lobster pot handy and don't mind doing this in a pinch. Lol