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Originally Posted by AKmark

This may help, take note of the salt index. I get my recommendations for runoff from Hydro Gardens growers manual.

https://aggie-horticulture.tamu.edu/...soluble-salts/

Interesting, I never thought of irrigation water building up salts in the soil...thanks...now I got something else to worry about

I used epsom salts on my plants a few years back and noticed the salts in the bottom of my grow bags on the outside, white staining in appearance and definitely salt.