10 Litre DWC x6 Plants(Busted)

I like Advanced Nutrients PH Perfect line. My last grow I was using water with pH 7.5 and 1/2 strength of nutes, they made it 6.8. Now I’m using very good spring water with pH 6.7, and no pH down is required. Solution is about 6.3-6.4 when I just mix PH Perfect. But as said already, it always depends on your water quality.

There are some additives, like calmag, that will do a number on your pH... but it's not the nutes or additives that are the real issue - it's usually the water that you're using. I've found Spring Water to be a lot more stable when it comes to pH issues than my regular tap water.... and would assume, though I haven't tried it, that RO water is even better. One thing I've learned is to only check the pH once a day at the same time of the day... it WILL fluctuate during the day for various reasons and I used to chase around madly as well trying to adjust here and adjust there... Just check it once a day... same time every day.... life is a lot calmer and surprisingly, the pH is more stable as well. Good luck!

Well. Adding in Adv nutrients with what you are using is going to mess around with your PH.. the trio you have is stable enough.. and using big bud is what's messing you grow during flowering.. No matter what you use. Flowering periods are demanding, pH wise. But keep hydro nutrients to 1 brand if you can. This alone will make for a much more stable PH. GOOD LUCK