Stop buying bottled nutrients, mix your own for pennies

Been mixing my own base nutrients from raw salts for about four years now, and the cost difference is honestly embarrassing once you run the numbers. A 2.5 gallon jug of a popular 3-part hydro line runs $40-60 at the grow shop, makes maybe 250 gallons of solution at full strength. That's around $0.20 per gallon. My dry salt mix costs me $0.02-0.04 per gallon, same ppm targets, same results. The core macro mix i use for veg is built around calcium nitrate, monopotassium phosphate, and potassium sulfate, roughly a 3-1-2 ratio by weight as a starting point, then dialed with magnesium sulfate for the Mg and S. You can hit a 1000ppm solution with these four salts for well under a penny in raw material cost per gallon once you buy in 5-25lb bags off Amazon or a hydro supply wholesaler. The one thing that trips people up switching over is calcium and magnesium balance. Bottled nutes have chelates and buffers baked in. With raw salts you're working with ionic forms, so your source water matters a lot. If you're on RO or soft tap, budget in extra calcium nitrate and mag sulfate, i usually run about 150ppm Ca and 50ppm Mg as a floor in veg. Startup cost for a full salt lineup is maybe $60-80 total and those bags last a home grower a year or two easy. Ran Ghost OG with this approach for three cycles straight, no deficiencies, no drama. The math just makes sense.

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Seedling9d ago

I’ve been running The Seed Pharm autos lately with bottled nutes and they’ve been pretty forgiving, but I’m curious how they’d perform with a custom salt mix. Do you adjust your ratios much when going from veg to flower, or do you keep it fairly simple?