So I recently just bought these fertilizers. Liquid and tablet form. The brand of the liquid is Otto and the tablets are Ista. I haven't used them yet because I'm kinda confused with the instructions. Ista says: "...and also enable a rapid growth and a long-term effecting period up to one year" Does this mean I replace them every year? I'm kinda doubtful of that. There are no other instructions. Has anyone else used this? How long do you think I should wait to add another? Usually its about a couple months, right? Otto says: "Do not use active carbon during application to prevent diminishing of medicine efficacy" I have a carbon filter, how am I not supposed to use it? If I do have to take it out, for how long? Thanks in advance!