Yes, thank you. This does helpHeres how you can understand how to convert EC / PPM =
Here's an online converter =
Answer: To obtain an approximate sodium chloride TDS value, multiply the EC reading (in microSiemens/cm) by 1000 and divide by 2. To get an EC value, multiply the ppm reading by 2 and divide by 1000. Thus, if your EC is 1: 1*1000/2= 500 ppm.
https://4hydroponics.com/site/convert-ppm
EC = Electrical conductivity
PPM = parts per million
If your using tap water then you will already have a base PPM (lets say 300 for an example), when the plant is young most people will only feed tap water as the plants will feed from the trace elements/nutrients that are commonly found in tap water. This is why people are reluctant to add nutes in at an earlier stage as the concentration will be too high in combination with the tap water. If you use RO water (reverse osmosis) it has a PPM/EC of 0 and a pH of 5 which gives you room to work with in regards to being able to add nutrients and feed your plants as soon as they pop up. As far as I know 200-250ppm is good for week 1&2 which is why you generally wouldn't add feed to tap water that has a ppm of that already.
This is just my loose grasp on the situation, hope it helps
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