i use the real cheap coco. i rehydrate it in a big 55 gallon tote. i do 4 cubic feet at a time. then i pot up in the pots im going to plant in and i rinse it real well with reg water. i dont ph this water. then i rinse agan with some calmag water at 250 ppms of cal mag. i use tap water so my ppms are like 380 when i add the cal mag. i dont ph this either and i water slowly until i get runoff of the cal mag water. i wait for it to finish draining then i water well with what i would use to start plants in. this is the only stuff i ph. this was the method told to me and i havent had any problems with it yet. and i use as cheap of coco as you can find lol.