Its5h1ll

@Psilocubensis, that depends on what run off PH and PH in of the last feeding was. There's no hard and fast rule that I use other than noting the last pH in after adding sulphuric acid and then again after the citric acid, and then from the run off pH I can get an idea of how much citric acid the plant used and how much I should add next time to maintain the average root zone pH I want. If you want to use it in your grow as pH regulation alone it will cause you problems with root zone pH always going too high, but in soil this may actually work really well if you do need to regulate the pH there

@Psilocubensis, sulphuric acid is used simply to lower the pH of the nutrient solution, the tap water here is 8.4pH so after mixing usually it's above 7pH before regulation with sulphuric acid. The citric acid is used to lower the pH further so a pH range is covered over a few hours as the pH naturally rises from the break down and plant uptake of the citric acid. But citric acid has another benefit, if you look up the Krebs Cycle you will find it's actually called the citric acid cycle too, and it's all to do with cell energy production and electron carrying etc throughout the plant. I wouldn't grow a plant without it

Congratulations on your harvest growmie 🔥

@Herikus, thanks! Can't wait to get them rolled up. Tall plant looks real frosty, it's a shame it's not gonna go full length but should still be mighty fine.