It was out of stock so have ordered through Amazon. Expecting by end of the week. I spoke to the company who manufactured the RO system and they confirmed PH level btw 6 - 7
My plants are only 2 weeks from seeds. I used Cana Coco which comes pre-buffered with Calmag. I still buffered it with Calmag before putting the plants in the pot. I make sure the medium is always moist and not dry