How long can tap water stay?

Hey guys! I've got 5 gallon container which I've filled with water 1 week ago. I dropped PH to 5.8 - 6.4 and now I am about to water my plants but I wonder if its good for water to stay that long??
The container is sealed. So how long can tap water stay good for watering?

Thanks!

Be sure to juat check the ph every time u use it to make sure it is still in ur ph range

Thanks! What about "getting bad"? Does it lose something with time?

I dont think so.its actually advised to leave your water out for 24.hours to.rid itself of chlorine and shit...but if your mixing your nutes in said water then.leaving it out for a week idk might wanna ask a hydro grower

Leaving your water out to long can be a bad thing the lack of oxygen can help anarobic bacteria grow, which is not always a bad thing but can be

As long as the bucket is in the sun you should be fine , any longer may be questionable

A Oz or so of 3% H2O2 , a good stir, and a few hours can help