I have a NFT system up and running with suggested Masterblend mix. With fans my original EC of 1500 has gone up to 1650ish and I have added rain water to bring it back down to 1450ish. My leaves are curled (photos of lettuce and parsley).
Do I need to add Ca when I refresh with rainwater?
What is up? I haven't been measuring pH… but from past experience this system runs around 6 with these nutrients and rain water.
by Inner_Letterhead5871
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