If you don’t have access to sea water can you dilute Sea90 with water for a similar effect ?
Top answer
yes ...i went with average salinity of the ocean to make my SW out of sea90 ....3.5% salinity that is 33g per QT of water
From the KNF library
From the KNF library
Drafted by Claude from Office Hours and the books
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Sep 2026
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3 sources
The library gives two ways to build it from sea salt, and both work at field strength.
- Add 30 grams of sea salt per liter to make 3% seawater. Then dilute it 1:10 for 0.3% or 1:30 for 0.1% for field use. (Office Hours Ep. 71, 24:14)
- Or skip the stock. Use 1 gram of sea salt per liter of fresh water. (Cho's Solutions, p. 15)
- For a big batch, the Pure KNF Manual lists 120 g of sea salt in 30 gallons of oxygenated water. (Pure KNF Manual, p. 53)
One difference matters. Drake's manual says the top inch of seawater near the shore holds the sea's microbes, and that this is what you bring to worn-out soil. (Pure KNF Manual, p. 53)
The library does not name Sea90. It does not say whether salt alone gives the same microbial effect as fresh seawater.
Sources
- 24:14 Office Hours Ep. 71 (Apr 2023) — Soil pH Biology, Sea Salt Dilution Ratios, Bacterial Mineral Water · “Add 30 grams of sea salt per liter to reconstitute 3% seawater, then dilute that 1:10 for 0.3% or 1:30 for 0.1% for field use.”
- p. 15 Cho's Solutions · “Make from sea salt: 1 gram of sea salt per liter of fresh water”
- p. 53 Pure KNF Manual · “1 gallon sea water or 120 g sea salt 30 gallons of oxygenated water”
