PH question (1st time grower)

If my PH does get to high what would be the best way to fix it and lower it down/or rise it? I heard the range is about 5.6 ish?

I had a friend whom used spa testers with HP, CaCO3, and so on. Said they worked good. But the ones my girl got for our spa only hits as low as 6.5 and just testing water I let site out for days from tap. Still reads upper 7s x.x will this be a big issue? I just posted something in plant problems But really didn't think about it till now. (https://www.rollitup.org/marijuana-plant-problems/494954-leaves-started-changing-colors.html) I am starting to think they could be linked... are they? :/

Get yourself a decent pH meter or at least some pH papers with a smaller range. Like 5.0-9.0. Ideally you want your pH to range from ~5.6-6.5 or even 7.0. Different nutrients absorb differently at different pHs. Use pH down to bring it down. There are a few pH downs on the market, one uses sulfuric acid, another nitric, yet another uses phosphoric acid, and some people use vinegar. Remember the first three will raise your levels of sulfur, nitrogen, or phosphorous respectively.
Screwed up pH can cause leaves to die or discolor. It can be from the pH alone or a deficiency caused by nute lockout at a high or low pH.

For 10 bucks you can get a drop test kit. And it will come with ph up and ph down. Depending on the size of your res should last a long time. Yes 5.6 is best but don't worry if it flexes between 5.1 and 5.9.

Phosphoric acid is the best PH down for plants. cheap too. http://www.dudadiesel.com/choose_item.php?id=FGphos

I got some 87% phosphoric acid... holy shyt that stuff is potent! a drop of this stuff is enough

Ph for hydro is between 5.6 to 6.0 nothing higher! Or lower!
You can use lemon juice to lower ph and baking soda to raise
Ph if you dont have store bought ph up and down.

Thank you everyone for replies and help! I got the PH to drop to about 6-6.5. Still a tad high. But off to the store to get more white vinegar. Ran out before getting it a tad lower. My girl seen me reading everyone's replies and see just rolls out. White distilled vinegar works great my grandfather used to use it. I am like what!? Why didn't you tell me before x.x

Now my bigger clone is acting up. x.x I am sure lots of things will take a few days to get back to healthy. But is there a window of time where I should be worried about?

Dude get lemon juice