Shoot Powder...Anyone Used it?

Just bought a product that was highly reccomended from the people at the Grow Store. It's called Shooting Powder, and it's a product high in Phos. It's used for the last few weeks of flowering. Curious if you guys have used it, shit is super expensive but I was told it's well worth it. One sack of the powder is used for 20 gallons, and the box comes with five sacks, costs around 64 dollars I was given a nice discount though. He told me he has customers who told him they would pay double the price of this stuff if it meant the store keeping it around (They get it shipped from Holland, and can only get so much) Anyhow, thanks in advance cannabis.com! :D :rastasmoke: