[bobo911]

My kitchen sink is plugged up, probably due to fat. Can I use septic powder to fix it?

[speedball1]

my kitchen sink is plugged up, probably due to fat. can i use septic powder to fix it?

I don't know what "septic powder" is but the best and most certain way to reomve a blockage is to snake the drain line. (see image)
You have a blockage in the horizontal line that runs from the trap to the stack. You have two options. You can plunge,don't forget to block the other drain with a wet rag jammed in it. Or if that fails you can remove a trap and go up the trap tail with a plumbers snake. You will meet some resistance at the bend in the wall but you won't have to put out over 6' of cable. As a repair plumber I have never recommended using harsh chemicals. Most of the time they don't work and when you try to remove the water you could burn your hands or damage your eyes. More questions? I'm as close as a click. Hope this helps and thank you for rating my reply. TOM