How do you know you ph drop from run off reading?
If you read run off ph i will say stop not accurate.
Gypsum and potassium sulfate sold for hydroponics can be used to increase the EC.
There is zero need for you to buffer your tap water. You should be taking care of buffering with your setup. I've used r/o water for 16 years now, with a ppm of about 4-12.
Besides, cannabis grows the highest quality when you have a full pH swing, with a balanced nutrient profile.
I wonder how I would go about obtaining a Soil Chemist consultation? Post on craigslist? lol... But seriously, I need one. University maybe?
I have been doing some investigation in aquarium water. They adjust the general hardness (GH) and carbonate hardness (KH) to suit their specific setup.
I would add the additional calcium, if the nutrient is low on calcium. RO Soft, sounds like a nutrient designed for clean/pure water to me. I'm not looking at the label and haven't done the research on it though, since I"m not using it myself.My thoughts are (I'm no soil chemist) that the nutrient "RO soft" from veg bloom is designed for water with a starting ec / pom of .3 / 150. The hardness / alkalinity / buffer is required for the fertilizer to work correctly and have no impact on the coco. But in my garden I am stuck with 50 ppm tap water. And I need to get it to 150, however I dont like the additional nitrogen from the calmag.