Reflush coco after charging / buffering

I Have a question concerning flushing coco.

1st i decompress the brick with hot tap water, then i flush it using tap water until ppm going out is close to ppm going in.

2nd i pre charge the coco with a solution of 25ml / Gallons of Magical (Calmag from technaflora). I let the coco stay in the solution for minimum 24h.

My question is when im done precharing the coco, should i rinse it again to make the ppm bellow 100ppm? Or doing so is going to destroy the cations again? Im a bit concerned about the idea of transplanting new clones into a coco that have 1100ppm of calmag in it!

What is the way you do it? Thanks

Use a pre-washed and pre-buffered coco like Botanicare CocoGro and re-hydrate with 1/4 - 1/2 strength nutes. Done. I grow in coco and use the Botanicare 5 kg compressed bricks. I don't flush at all. I just rehydrate with nute solution and use it. I never check runoff. Just what's going in. Most coco today has already been rinsed and buffered. Years ago it was a different story.