coco buffer water

ı use ro water.
what should be EC and PH. there are different information on the Internet for buffering, I'm confused.
do I have to do buffer 2 times? is 1 time enough? i make buffer after sterilizing in boiling water

are you like staging an advertising account?

I'm confused.

Since you've got pre buffered and treated coco that your only sterilising due to it been sat for a year and wanting to kill any potential bugs I don't see why you'd need to buffer it at all.

When I first hydrate my coco from brick I use hot water. Add calmag 400ppm and Ph it to 6.2. I let it sit in the bucket awhile. Done. All the extra rinsing and double soaking is not needed. If u let the coco get to dry it will consume and need more calmag. Dont give it calmag unless u see your plant asking for it. It can cause lockout of other nutes.
It should be enough in your nutes unless plant calmag greedy.