Cal-mag Questions

29menace said:

Hi guys. If you were running hydro with R/o water that has virtually 0ppm what amount of cal-mag would you add? What's your base ppm before adding nutes. Just wanna get a rough idea so I can calculate how much I need to buy for my next grow.

I basically ran tap until now with some filtered but this grow I'm solely using filtered to see the difference.

Thanks for all replies it's appreciated

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Doug Dawson said:

I believe around 2 to 2.5ml per gallon.

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myke said:

150ppm is what i use with tap.

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29menace said:

With tap? Your ppm in the tap water must be low yes? Mine has an EC of 0.6 hence the filter system this run lol.

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jondamon said:

If you’re adding back Ca and Mg after Ro filtration then you want between 0.2-0.4EC added back.

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29menace said:

With tap? Your ppm in the tap water must be low yes? Mine has an EC of 0.6 hence the filter system this run lol.

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