lol im shite wit numbers..
dya use it like pk13-14? could it be used weeks 3 til flush?
Well.....
It's one of the two ingredients that PK13/14 is made from.
To be honest it's fucking strong so if you haven't got an EC pen than I would put no more than 1 teaspoon per 10L of water.
You can't use it every feeding like regular PK supplements cos you'll just burn your plants and get massive salt build up.
On an 8 week strain I'd use it once in week 5, then in once again in weeks 7-8.
You shouldn't use any other booster with it, just base nutes and that as your booster.