Cal-Mag needed for Distilled or RO water?

[clowntown]

My tap EC was 0.06 and I had calcium deficiencies that were fixed with a little bit of CalMag+. Later on though, I had some problems that may have been caused by too much CalMag+ although I was never able to find out for sure since I had to cut the show early.

 

[OsWiZzLe]

my plants look much better since i added the Cal-Mag to the mix....

 

[Guest]

I think so. And my experience confirm it. My tap water have just 2ppm of Mg and 12ppm of Ca, low enough to compare it with RO water.

IMHO, most Cal/Mg problems are more related to ph than to any insuficient feeding of any of both.

So each grower, according to the ph regime used must find the right amounts of Ca/mg in the NS. As i stated some times before, when using ph in the upper part of the range, often is required to add some Cal/mg, or at least some Mg to keep Ca/Mg balanced in the media.

We cant expect growers using differents ph regimen work with same feeding composition with same results. Both thing are related, and i believe do little sense talking about absolute quantities of Ca/Mg used without taking into account how they are uptaked (ph).





I dont think so. My tap water have very little trace elements in it. Just 0,071ppm (Fe), 0,031ppm (Mn), 0,3ppm (Chlorine) and 4ppm of silicon (this high percentage of silica gives my tap water a high ph, although its very soft, from 0,7 to 0,14 mS with little carbonates).

Again, it depends of ph used. Most micro's uptake are severely reduced at high ph, so when using high phs, higher concentrations of micros are required.

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