how am suppose to keep track of my ppm like this!?

MI5

Member
I've got a DWC Hydro. I put my nutes in and took a ppm reading to use as my target. Over two days, the res goes down so i have to top it up with water. the water alone, is 200ppm. when i add just water to the res, the ppm goes up but thats not nutes. The ppm keeps fluctuating and I dont know wat to do...

i use the lucas formula
((target ppm - current ppm) / target) * 8 ml per gallon * res gallons = Flora Micro (ml) double this figure to get Flora Bloom (ml)
 
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