hey there Mushman, chlorine is a gas at room temperature so it will eventually evaporate, the best is to just let a bucket of water sit for half a day or overnight to get rid of the chlorine, that's because adding reagents simply creates granules and precipitate that will pollute the water with little clusters of poison for the plant. Usually you want to use a filter for that reason. The plant won't like it . Hope this helps ! 🚀