N0fun

@N0fun, ah yes, PK is Phospor and potassium from the NPK. NPK is the nutrients you're giving it, usually on the label they'll tell you what's inside like this NPK 4-2-2 (veg) or 2-4-4 (flower), a PK boost is NPK 0-4-4 something like that ... the numbers are less important than the ratio . http://www.canna-uk.com/pk_13_14 i dont sell this stuff but i use it lol ... so you just add this to your regular feed, you shouldnt need to change anything. (if you do, add some cal mag, it's late but you need it kinda - never grow without it from now on) sounds complicated , but it's very simple, hope this helps ! :rocket:

@CRiSPrGrow, Thank you very much .. this is very helpful. I have just a noob question : How i should add some PK ? what is the preferred method at this point?