Change in specific gravity due to evaporation.

[tonyvan]

Is there a formula to calculate change in specific gravity due to evaporation ?

 

[Dr. Phil]

Welcome to r2r!
Not completely sure that this link is allowed (if it isn't mods feel free to remove).

Resulting Salinity Calculator

Aquarium calculator; Estimate the resulting change in salinity when water is added, replaced, or evaporated.

www.hamzasreef.com

 

[SPR1968]

There probably is but you’ll need a mathematician for that one, but you shouldn’t be getting a change anyway, you need an ATO system and that will stop any changes to salinity if that’s what you mean.

And Welcome to R2R!!!

 

[roblox84]

Any change in specific gravity due to evap is very minimal unless you have a nano reef or something small.

 

[tonyvan]

Welcome to r2r!
Not completely sure that this link is allowed (if it isn't mods feel free to remove).

Resulting Salinity Calculator

Aquarium calculator; Estimate the resulting change in salinity when water is added, replaced, or evaporated.

www.hamzasreef.com

Any change in specific gravity due to evap is very minimal unless you have a nano reef or something small.

 

[fishguy242]

hi welcome to the reef going to love it here!!
lots of fun/info/fun/help/fun....
pics!!!..we all love pics..

 

[tonyvan]

Have to replace manually because of system setup. Approximately 30 litres daily. Would like to use a conductivity meter to automate but I don’t know if there is one sufficiently accurate and if it can be used to top up.

 

[fishguy242]

what size tank? tunze best ato imo

 

[ThRoewer]

I actually used the salinity module of my Apex and an Airlift pump to refill my tank with RO water or Kalkwasser. Worked like a charm.
I still had to manually add saltwater that got lost via the skimmer, but the tank salinity was always spot on.

This is the Apex code:

Fallback OFF
Set OFF
If Condx3 > 34.4 Then ON
If Condx3 < 34.4 Then OFF
Defer 005:00 Then ON
Defer 000:30 Then OFF

 

[NS Mike D]

here is a calculator. I input 378.5 liter tank (100g) starting at 35ppt and evaporated 30 liters which rose salinity to 38ppt

Resulting Salinity Calculator

Aquarium calculator; Estimate the resulting change in salinity when water is added, replaced, or evaporated.

www.hamzasreef.com

 

[tonyvan]

what size tank? tunze best ato imo

1000 litres. Tank level is constant but sump level can vary due to reasons other than evaporation ( such as detritis build up in filter that the water passes through).

 

[tonyvan]

Thanks Dr Phil and others for the useful info.

 

[Dr. Phil]

Thanks Dr Phil and others for the useful info.

You are welcome! Like others who have posted I highly recommend and auto top off system. They make life much more enjoyable. Haha I don't think I would try to control it with a conductivity probe. Just use float switches or optical sensors and it will be much more reliable.

 

[tonyvan]

Thanks but as mentioned above my system is not conducive to water level sensors.