Making seawater with the app dilutions
I bought the app and have a question about making seawater. So if i make a 40 gallon batch it's telling me ~6000mls of SEA. If I dont have access to seawater and have to create it from sea salt, would I just take the amount of liters, 6 in this case, and multiply it by 35gs? So 6 x 35 = 210gs of salt?
Top answer
This was an area of confusion for me as well. I asked a similar question here once and Drake replied, instructing me to mix up the rest of your solution, and then basically add 1 gram of salt for every liter of solution. Apparently that makes for a pretty accurate replication.
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
Your method is right. The library's figure is lower than 35 g. Full-strength reconstituted seawater needs 30 grams of sea solids per liter. For 6 liters, that is 180 g. (Office Hours Ep. 28, 21:07)
A second recipe gives the same scale. In a 30-gallon batch, 120 g of sea salt stands in for 1 gallon of seawater. Dissolve the salt in the water. (Pure KNF Manual, p. 53)
You can also skip the concentrate. For diluted seawater, Drake's chart says to use 1 gram of sea salt per liter of fresh water. (Cho's Solutions, p. 15)
The library does not say how the 30 g figure compares across salt brands. It also does not say which route the app expects.
Sources
- 21:07 Office Hours Ep. 28 (Apr 2022) — Beef Aminos, Coral Calcium, and IMO Troubleshooting · “full-strength reconstituted seawater needs 30 grams of sea solids per liter.”
- 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”
2 more answers
To make seawater at home, add 35 grams of salt to a beaker, and then add tap water until the total mass is 1,000 grams, stirring until the salt is completely dissolved in the water.
Remember 3 is the magic number - the ocean is a avg of 3% salinity - to make a brine of 3% u add 33g of sea salt to 1qt of water this also makes a great pickling brine to pickle just about any thing
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