If I want to make it 0.069ppm, 75*0.069=5.175, then 5.175/5=1.035, then 250*1.035=258.75, then 258.75/77.4=3.34ml, that is, if I put 3.34ml dtpa 6% into my 250ml container, I put it in 5ml dose into my 75liter tank. if i give Is it true that 0.069ppm iron will be dtpa?🙏🙏