Ok so 5ml will raise 10 gallons by 7 ppm so will 10ml raise 20 gallons by 14ppm or will it still be 7 ppm per 10 gallons. I'm asking because I have about 40 gallons total water and i dosed 20 ml and got 30 ppm(redsea) so if this makes sense 40 gallons is 28 ppm if it keeps adding on. If not then I'm lost but i do know 1ml=1.5 ppm for the future