What is wrong with my BioBizz calmag? Very low ppm/ec at max dose, but my EC meter is working correctly

[kreikrei]

Hi!
I am very confused, would appreciate your help!
I recently bought an RO machine, because my tapwater is 300+ppm
I use BIOBIZZ nute line (Grow, Bloom, algamic, activera, topmax)

Biobizz recommends 0.5-1ml/L calmag, IF YOU HAVE SOFT OR RO WATER (thats what I have)

So, today was my first big watering. It is day 15 for my autoflowers.

1. I poured in 2 liters of RO water - EC meter shows 5 ppm
2. I add 1ml/l Biobizz calmag (so 2ml total) - I was expecting 150ppm, but I got only 40ppm.
3. I tested my ECmeter against other nute solutions, it shows the correct value, so my EC meter is working

40 ppm is clearly too LOW for plants calcium and magnesium requirements right?
But I get 40ppm of calmag if I use MAX rcommended Biobizz dosage.
To get 100-150 ppm of calmag (which I see recomended), I would need to add 3-4x recommended biobizz dose.

What is wrong here?
Can my calmag be expired/bad batch? (I have 2 bottles for 6 months, tested both, and both give very low calmag ppm at recommended dosage per litre)

Thank you!

 

[Phytoplankton]

Are you seeing any problems with the plants growth? If not, carry on!

 

[kreikrei]

Are you seeing any problems with the plants growth? If not, carry on!

You replied to me on roll it up yes?

Someone answered that my ppm meter doesnt show correct calmag concentration, because my calmag is organic... So I have to measure precisely using a syringe

 

[Phytoplankton]

It shows the correct calmag concentration, but the PPM's will be lower than if you use non-organic calmag, because non organic is chelated and the Ca/Mg disassociates when the product is added to water. The chelate shows up in the PPM reading too.