recommend salinity

[weileong]

currently at 1.021, is this good for coral? or should be higher? pls advise.

[harmony]

Typically... sg 1.023-1.025. I don't know if there are any Corals with requirement outside this range.

[Tanzy]

Salinity 35 ppt (parts per thousand; g/L)

Specific gravity (S.G.) varies depending on temperature. You'll need to read off a conversion table to get salinity from S.G.

[weileong]

ah found it!

Salinity/Specific Gravity conversion

[akumanohi]

wad does ppt mean?? wad is parts per thousand?

[terryansimon]

its a form of measurement I think. ppt is precipitate, in chemistry terminology. haha totally different! okay I'm just kidding there. =(

but yeah it is a form of measurement.

[akumanohi]

how to measure ppt? i dun get it man.. i noe wad is sg but dun realli noe wad is ppt? can explain more clear to mi pls? thankx

[terryansimon]

urh. its just a measure of concentration. don't need any maths formula or what. just get a decent hydrometer to measure the salinity of your water can liao. will automatically tell you how many PPT.

[akumanohi]

ar? does a hydrometer tells? oh... okok... i got it... izzit the wan beside the 1.021 that wan?

[terryansimon]

urh yeah. should be. a hydrometer tells you the salinity and the specific gravity of the water itself.

[akumanohi]

as Tanzy's words, how to convert and wads the diff between the temp and saltility of water? how to make them equal?

[terryansimon]

they are equal. its proportional I think. be it inverse or what.

so and so specific gravity = so and so salinity. provided temperature and pressure remains at constant.

[FuEl]

Ya..temperature will have an effect on your specific gravity. Water can be more dense at a lower temperature, meaning you will read a higher specific gravity.

[Tanzy]

Salinity is how saline your water is or how much salt is in the water. Parts per thousand or ppt means grams per litre of water. Therefore 35 ppt means there are 35 grams of salt per litre of water.

Hydrometers only measure Specific gravity or S.G. of the water which is the ratio of the weight of the water to the weight of the same volume of pure water. S.G. must be converted to Salinity because S.G. of water changes according to temperature of the water. That's why there's a thermometer inside the lead ball hydrometers. The thermometer is not there for show.