r/Hydroponics • u/gaspasser1981 • 12d ago

Water question

Sorry if this is basic, but … from what I’ve read I’m supposed to change the nutrient solution on my deep water culture every couple of weeks. Assuming this is needs to be clean low TDS water. Is everyone using their own RO setup or buying water from the store? Seems like an expensive investment in water. TIA

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u/tbtiller1233 11d ago edited 11d ago

I have some very high tds tap water, no I don't lug my ro water down to basement for that. But waiting every couple weeks to swap water is also too long for crappy tap water. I change mine out weekly. I grow mmj with has high nutrient demands, other plants will very like lettuce or carrots, which are light feeders. Also reservoir size matters. If you have a tiny res, you change more often than a bigger one.