So at home I am developing a fertilizer irrigation system. So when the water is on, it siphons off concentrated fertilizer and mixes with the water. Which enables me to feed and water my tomato plants unattended. So essentially I need to make the solution for the irrigation system. The system works at a 16 to 1 ratio. 16 parts water. 1 part fertilizer. So on the directions of the tomato fertilizer it says to use 2.5 grams for every gallon of water. That is the regular strength u put on the plants. So for the irrigation system I have a 5 gallon bucket in which I am going to put the concentrated solution. Which needs to be at 16 to 1 ratio. So do I put 2.5 grams of fertilizer x 16 (the ratio) x 5 gallons? Or 200 grams of fertilizer. Is that correct. Or can someone give me the proper equation to figure this out. By the way I will have a back flow preventer on the system. I know that will come up