3ppt of salt

[scotty333]

Hi guys

Anyone solve this puzzle for me

3ppt salinity increase in 380ltr water = x amount of salt

 

[Garf]

Hi guys

Anyone solve this puzzle for me

3ppt salinity increase in 380ltr water = x amount of salt

Try this;

Direct Salt Addition Calculator https://share.google/30rxDehpkMfOJPRwN

 

[scotty333]

Try this;

Direct Salt Addition Calculator https://share.google/30rxDehpkMfOJPRwN

Cheers buddy I need 4kg over the week I guess

 

[Reefering1]

Cheers buddy I need 4kg over the week I guess

8.8lb of salt sounds like alot to move 3 ppt

 

[Reefering1]

I get 1.43kg, using that calculator garf provided

 

[Randy Holmes-Farley Verified Community Expert]

Hi guys

Anyone solve this puzzle for me

3ppt salinity increase in 380ltr water = x amount of salt

A better way than adding salt is to just replace evaporated water with seawater until you get to your goal.

 

[scotty333]

Guys
The calculator says 3kg but ai says 800g
So which is it ?
I’m going off 1.024 - 1.0255

Got it — you want to raise the specific gravity in your marine aquarium from 1.024 to 1.0255 in a 380-litre system. Let’s carefully work it out step by step:














1. Understand what this means

• Specific gravity (SG) of natural seawater is usually ~1.026 at 25 °C.
• Raising SG from 1.024 → 1.0255 is an increase of 0.0015.
• Roughly, 0.001 SG ≈ 1.3–1.5 g salt per litre (rule of thumb, varies slightly with temperature and brand of salt mix).

2. Work out the grams per litre needed

• Target increase = 0.0015 SG.
• Approximate salt per litre = 0.0015 ÷ 0.001 × 1.4 g ≈ 2.1 g/L.

3. Apply to your tank volume

• Tank volume = 380 L.
• Total salt needed = 380 × 2.1 g ≈ 798 g.

Answer: You’ll need about 800 grams of marine salt mix to raise salinity from 1.024 to 1.0255 in 380 litres.











Tips:

• Dissolve the salt in a small amount of tank water or top-off water, then add gradually — don’t dump dry salt straight in.
• Re-measure after mixing, since evaporation, rock displacement, and accuracy of your refractometer/hydrometer all affect the reading.

Do you want me to also give you the calculation in terms of cups/spoons of typical reef salt mix instead of grams?

 

[KStatefan]

1.024 to 1.0255 is not a 3ppt increase.

Where did the calculator show 3kg?

 

[scotty333]

1.024 to 1.0255 is not a 3ppt increase.

Where did the calculator show 3kg?

Yeah sorry I messed up
It’s 1kg