I love this product. This is the best and most efficient soft phosphate I have used. I typically use seabird guano because it is more concentrated then the phosphate I can source locally. This stuff equally as strong. I have been really digging this stuff I just too dress like I would with the sbg. I was research and when they mine for the Cal phos they are required in the states to restore the land they extract the phosphate from. That had me intrigued then once I gave it a shot I was sold.