I use tap water, comes in at around 350ppm
Yeah so you already have high ppm to work with. But others might have more insight as I am still new to the plants.
But I use a little under the recommendation for Cal-Mag Plus but I also have other nutrients that go in that compensate. The trick I had to figure out was about how much.
When I was using the Fox Farm nutrient line I was using the recommended amount. The nice thing about a good coco blend I’ve found is you can make corrections really easy along with flushing.
If you don’t have some, FloraKleen is made for it. If I really need to go to zero a couple gallons of water mixed with it and I can remove any mistakes.
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Yes my water is not ideal…
Thanks for the info, i will look into the florakleen for sure 
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Does anyone here uses mineral nutrients + bacteria or fungi ?
What is AN?
Advanced Nutrients line.
I just received my order from trifecta of their myco supreme mycorrhizal fungi, this is the first time I’m going to be using myco in any of my grows I’ve heard great things about myco in grows and I’ll be sure to post my results, I have a before myco control grow flowering now and my next run of the same strain same batch of seeds will be with myco. Should be interesting
Used it. Got 20 percent thc buds. Amazing weed