I decided to try out Advanced Nutrients 3-part PH Perfect this time. I was impressed that not only does it maintain ph but it allows the absorption of nutrients in a wide range of ph values as well. I am very happy with the PH balancing effect and has worked as advertised. At first I went with a very low dose like with other nutes. Unfortunately I ended up with a shit load of deficiencies because of this. I believe that because it's meant for cannabis unlike most other nutrients it's also meant to be used at full strength? Little did I understand that at full strength you're using half of a bottle which is a full litter! You're supposed to use 4ml per liter which for 30 gallons is 480ml. That comes out to half a bottle and you're supposed to change it weekly. That is some seriously crazy expensive shit. That comes out to 25 bucks every two weeks. Am I missing something here or is this ad crazy as it seem? For anyone using Advanced Nutrients 3-part ph perfect. Have you tried changing your solution on a monthly basis? If you have attempted this did you have a positive outcome. I know many people who do this with other nutes but they are all different.