Should I let tap water sit 24 hours?

Giving your plants "room temperature" water is more friendly than either colder or warmer water, straight out of the tap. I personally do it religiously (let the water sit for 24 hours minimum) when germinating seeds. Allowing the water to sit will allow most of the chlorine gas evaporate out of the water. Whether this is beneficial or not, I know I prefer not to drink chlorinated water and rain water, which the plants have evolved with for Millenia, certainly doesn't contain chlorine. One study does not prove much, and the study didn't say if the soil microbes recovered to their pre treatment levels or if their levels decreased due to the lack of chlorine. Granted, there are a lot of products designed to hook growers into buying stuff they don't actually need or has no scientific value (such as molasses), but if letting tap water stand for some time and "acclimatize", and if it is doing no actual harm, then why not let it stand. Even if the outcome is largely psychological, does it really matter, as long as we growers think we are doing everything we can to pamper our plants, I can see no drawbacks in getting rid of a little excess chlorine for our babies' benefit. At least they will appreciate room temperature water, at the very least. Hope this helps,.... Organoman.

Chloride is a -ve ion that commonly binds to essential nutrients (NaCl, CaCl, MgCl2, ect.) and is harmful to beneficial soil microbes. It will affect your plant - it is not a myth like some are claiming here. You can purchase an in-line chloride filter online (I use one on my garden hose in the summer), or you could use a Brita filter. Letting the water sit will reduce the Cl concentration... but won’t be as effective as actually removing it with a filter.

Yes! Let it sit for 24 hours—- unless you are in a pinch and the ladies are thirsty. This is for a few reasons: seedling like 72 degree water, veg is 70 degrees, and flower is between 68-65 degrees—- go colder later. So you want it to sit to acclimate temps. Don’t want to shock the roots and stunt growth. Also, as mentioned, chlorine is not ideal for plants—- in Chicago, our water smells like a pool! So I let it sit to evaporate out. Good luck! ✌️🏻💚🌿

Tap water has chlorine in it, which will kill all the good bacteria in your soil aiding your plant to grow. You can place a bubble stone in your water bucket, should evaporate the chlorine faster. Greetz Pangrow

Another sort of Cannabis growing myth.. Plants actually use Chlorides. And there isn't really any real data to say that letting your plant water sit for 24 hours negatively or positively effects your water. There is a lot of people do things and they think it makes sense so they back it up without any real information or understanding of why we do what we do. "“In one study, researchers continuously applied highly chlorinated water to soil for 126 days. Two days after they stopped, the soil microorganism populations reached pre-treatment levels at all depths of soil.”" "This is just one example of how quickly microbes grow in soil and why adding things like biostimulants, humic acids and mycorrhizal fungi have no effect." https://cannabistraininguniversity.com/blog/growing-marijuana/is-it-okay-to-use-tap-water-to-grow-cannabis/#:~:text=Many%20cannabis%20growers%20who%20use%20city%20tap%20water,can%20usually%20grow%20fairly%20well%20with%20chlorinated%20water. https://www.gardenmyths.com/chlorine-chloramine-plants/ https://www.gardenmyths.com/anecdotal-evidence-not-worth-the-screen-its-displayed-on/

Yes, plants do not like chlorine, especially the roots. So that is the purpose.

Servus Rick, You do this to get the chlorine, which is a ammended to our tap-water, evaporated. So, no Cl for our Damsels. Servus OimRausch