Hydrometer

[Lawrence]

Dear all,

Can I ask if the hydrometer green line is below water level & measure at 1.10 is it acidic or alkaline? Is it too much salt or less?

Pls advise,

[Kalib]

First of all ,lemme make things clear. A hydrometer does NOT measure the pH of water. It measures the salinity(or specific gravity,SG) of the water.

The SG of saltwater should be at 1.023-1.025. 1.10 is too salty, must dilute the water with freshwater to lower the SG.

[SpiderOne]

if ur Sg is 1.10 ur green line is going to be way above water level not below. u sure u read correctly? Salinity should ideally be 1.021 - 1.024

[hammer99]

Hi,

A question :

if the salinity is at 1.022 to 1.024, does it mean that the PH close to 8.2

If there any relationship between salinity and PH

Thanks

[Ammonit]

Hammer99,

Salinity has nothing to do with pH. They are two different parameter. Pls read up on the matter and difference between all the water parameters.

[Lawrence]

have also change half of water but notice the hydrometer is still 1.10 water level is above the green lei, pls advise!

[Morgan]

Is the green marking above the water line or below the water line?

1.10 is too salty....you should add water to dilute it.

[Lawrence]

The green marking is below the waterline! Thanks!

[Lawrence]

Dear All,

I see the wrong reading it is 1.010 green is below the waterline!

[blacknails]

Ok then you should add more salt to make the reading around 1.023..

And pH is determined and buffered by your coral sand (I think) and has nothing to do with your hydrometer..

I dun really know what the green line is for but could it be that the water level in the hydrometer should be at the green line? You should ask the LFS how to use the hydrometer first, actually...

[Volitan]

Dear All,

I see the wrong reading it is 1.010 green is below the waterline!

This is good for brine shrimps.

[Volitan]

This is good for brine shrimps.

Or is it 1.012??

[Tanzy]

Hydrometers only read specific gravity (S.G.), not salinity.

blacknail,

Please change your avatar picture. It's not appropriate in this forum.

[FuEl]

hhuH? I thought brine shrimp hatch in the same salinity as seawater? Lower salinity possible meh?

Anyway..Tanzy...so the difference between S.G and salinity is that salinity measures the percentage of salt in the water...while specific gravity actually measures the density of the water which actually varies with temperature?

[regularguy]

salinity measures the percentage of salt in the water...while specific gravity actually measures the density of the water which actually varies with temperature?

from my understanding, that's correct but lets not confuse lawrence further here.

[ozy]

hhuH? I thought brine shrimp hatch in the same salinity as seawater? Lower salinity possible meh?

Anyway..Tanzy...so the difference between S.G and salinity is that salinity measures the percentage of salt in the water...while specific gravity actually measures the density of the water which actually varies with temperature?

Ok, I understand this and I know that salinity is the actual parameter we are trying to achieve. Is there a ratio as to the volume of water to the amount (weight) of salt to achieve a more accurate salinity?

What is the ratio? Can anyone care to share?

[hammer99]

Hi,

The approximate ratio is 1kg of salt equate with around 30L of tape water.

I've another question :

So does it mean tat if the salinity is right, the PH may not be at 8++

so if my tank doesn't contains any coral sand, the PH will remain at 7

Thanks

[Tanzy]

Salinity is not directly related to pH. You can draw conclusions that at a certain salinity the water will be at a certain pH. Salinity is just a measure of how much salts are in the water. pH will depend on the composition of the various salts in the water.

Coral sand does not buffer the water at normal seawater pH.