You might be able to determine the amount of chlorine in your tap using pool test strips/chemicals.
If it barely registers, I would probably continue to use it.
Had to stop using my tap because the ph and ec varies randomly thru the year.
I never bubble for dtw coco. Bubbling effs with my PH.
Dude, You want it to mess with your PH in the tap water only. Thats the whole point of bubbling for 24 hrs. Get all the shite out. It will evaporate or whatever but basically bubbling is the first step to clean water to make a feed. Mine starts around 7.1 or 2 & goes down to 6.8. After mixing my (New To) Jacks nutes it drops a lil lower then id like at 5.8-5.9.
Some feeds may get a drop of silica prior to adding the base nutes to get that .2 higher i wanted. If not then i have organic stuff that will raise it like Floralicious Plus. Or, whats wrong with a drop of PH up? Add before Live Bennies.
Sure beets nasty, chlorinated & god knows what else water you're starting out with.
My water smells funny coming from the tap. First year here didn't even give it a chance. Straight to a 0 ppm RO Filtration set-up. Worst mistake i could've made.
If your water is questionable maybe consider the simple double Charcoal water filters. Few steps before true RO. 2 small filters mounted to the wall. Easy & won't strip your mag/cal. Or waste water but will eliminate debris & most unwanted stuff,should take care of chlorine too.
Guys, Bubble your rez's. Cannot stress this enough. Still standing water is not the best to use.