or just use good soil with an ability to buffer the ph , or add lime . adding chemicals to your soil will add chemicals to your plants , get a good organic soil with good buffering ability and theres no need to fuck about withh ph ,, i aint tested my ph since 1st grow , im on 3rd now , no problems regarding ph . organic weed tastes 10 x better n sweeter that chemical salt grown weed and also you wont be smoking shit thats gonna kill ya lol

cant beat allmix , you can throw ya ph meters away with that shit