PPM question

Rain water is never pure my friend.tds and ppm are measurements of amounts of nutrients that particular water can hold.If you are using a feeding chart through GPL or Advanced they work that out for you.

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you can mesaure this with something called a TDS pen. To get the numbers your looking for use the ratios of nutrients from the brands your feeding with, and dilute it into the main bucket to get their. eg. 2ml grow, 1ml bloom and 3ml micro. add all this into your jug and keep adding more till it hits the range your looking for. What also works is use the ratios 2:1:3 but change the amounts. 1ml vs .5ml if you know it only requires 1/2 to get to the ppm range you desire. Note that some companies feeding schedules need some nutrients to be mixed in first then the rest. This is a great reference for feeding autos and how old they are. its not 100% and may require adjustment if your plant is huge or small. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ Best Of Luck!

Whatever you are doing you are doing it right. Your plant looks spot on. So yeah. Don't worry about reaching the required amount of ppm in 1 feed, can be reached over few feeds unless your doing DWC. But soil and coco once your giving key nutes and right ppm over a space of time I said you'll be all good.

3-500ppm for 0-1wk or no nutes will work. 4-700 wk 2-4. When u start flowering 9- and can be pushed to 1400 max depending on strain some like more nutes than others auto like less nutes compared to photos. But them numbers u said will work 2. Be sure to add a micro to your list of nutes to help uptake. Happy growing, good luck.