Or just go organic and worry free with Biotabs!
trouble is, there is no one fits all feed, it aint out there......................there is a good reason for that, in veg you need high nitrogen and in flower high PK...............................biotab NPK is "7 / 7 / 7"..................... good for veg, not good for fruiting.......................fruiting is the longest part of the grow by 30% in time value....................better to feed a flower nute high in PK..........................for best flowers............ 2 biotabs in 15ltr pots is no way going to feed a plant for 100 days right ??......................... you would use a ltr of feed right.........................twice the weight of the biotabs.......................... you can control nutes you add into water and administer, you cant remove biotabs from soil if it burns or changes soil Ph your in the "P@@"...................... ive seen em used, but only once ! ........only my experience and from watching outcomes on ere........ALR