i think its importiant for people to know that your plants have spent their entire life making cells one way, then when you switch to just water the cells are weak and not very durable, basically aren't made well. i dont know why this happens, but i seriously think this to be the spotting then crusting of top leafs problem....its like the plants burn from light that shouldn't be affecting them in any way. i also think spreading bad info is a no no, so please sound off and help with this riddle
lots of different opinions on should you ph your tap water. at 8.2 i probably would. i dont use just water ever anymore, but if i did use just water for something, say a flush, my tap is like 7.2 7.3 i wouldn't ph it myself. i dont wanna put the down buffers in my soil, and its a chance to re buffer your mediums ph level so you dont have to feed at 6.5, instead you can feed at 6.2 and let the plant get food from all ranges of the ph scale.
just my 2 cents