posted 5 months ago
Letting tap water sit overnight will allow any chlorine to out-gas. BUT.....most water departments use chloramine now (the nasty stuff you get when you mix chlorine and ammonia), specifically because of the fact that chloramine doesn't outgas like chlorine does, so they can use less of it. Since chloramine doesn't outgas by just letting it sit overnight, it has to be removed by filtration, reverse osmosis, or distillation.
All that being said, I use chloramine-filled water from the hose on my garden.