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really confused about PPM

Since switching to RO filtered water i am quite confused

the dutch pro chart says 250-350ml of A + B per 100l
0.1ml of cal mag per L
0.4ml of silicia per L

this in my RO water is 500ppm
EC 1.05

i'm with very long vegged plants just on day1 12 12 first bloom feed
i was just following the bottle in veg 1ml per litre of cal mag and silicia
almost doubled up on everything to reach 800-900ppm and just ended up with deficiencys as soon as i included the cal mag i guess from too much extra cal...

really confused about PPM


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