I just got about a Years supply of Sensi Bloom part A+B ph perfect and used it for about 2 weeks now and I must say its awsome. No more PH up/down No more PH PPM TDS meter just add nutes and your done. Not that I had to add much ph up/down ever but I have 4 large grow rooms and it took time out my life. The only problem now is you cant but it in th good ol USA. Those who grow know why already so I wont go into the story but this stuff is goona change the way the world grows. Now 9 out of 10 problems most grower face aregone 4 good.