closet grower you must have decent ph'd water, I say always ph your water it is much better for your plants. The way i do it is if i was feeding with a ph of 6.8 then i do a flush with 6.5 never going under a ph of 6.2, that is for soil of course and just take it down to 5.8 to 5.5 with my hydro. Also you should let your tap water sit out for at least 24 hours to let the chlorine dissipate. hope that helps and all grows well