I have 2 Milwalke PH600 pens and have cal soultion. I use about 2tsp Tiger Bloom and 1 TBl spoon Big Bloom to gallon of 7.0 water and it was like PH 4.9 before I added about a good tsp+ of GH PH UP just to bring it up . I will start watering without adding PH Down from now on.My plants are outside 1 Hermey and 1 nice 5'+ Female and both look healthy and sooo close to harvest.
Thanks for the help as always.