A plant doesn't see brand names — it sees elements in solution. This tool resolves whatever you mix (raw salts, commercial products, or both) down to the ppm of each nutrient the roots actually get, and lines that up against the band your crop wants at this stage.

• Raw salts are computed exactly from their chemical formula — potassium nitrate is 13.85% N and 38.67% K, every time. Use these for precision.
• Commercial products are label-derived from each product's published composition. They carry a "label-derived" badge and should be checked against the bag in your hand — manufacturers reformulate, and our catalog is still being verified.
• The target bands are typical hydroponic ranges, not gospel. Crops tolerate a window; the bands orient you, they don't dictate.
• EC is an estimate from total dissolved solids — a planning number. The reservoir meter is the truth.

On tank splitting: calcium and phosphate (or sulfate) are happy together in the dilute final reservoir but precipitate in concentrated stock. If you pre-mix concentrates, keep calcium in one tank and phosphate/sulfate in another — the analysis flags this when your feed carries both.