what ratio do you us per gallon of water?I learned a great trick on chlorinated water. If you crush some vit. C tablets into water the vitamin c chemically adheres to the chlorine and binds it in a non-toxic form. I use it every time I add water from the tap to my fish tank. Fish are super sensitive to chlorine or chloramine (which is what we have in our water). I have not had one fish die after I started using the vit c tablet crushed. It works and adds value to the health of the chickens too, it's much cheaper and easier than fish tank de-chlorinators.
I don't use it in my FF though and have a great ferment going. But I have a 5gal bucket so it's large scale compared to a quart jar. It might make a difference.