Got kalk ?

Say your sump has 5 gallons of water in it, but could hold 10 gallons. If you had a 5 gallon reservoir full of freshwater that drained into your sump because of a faulty float switch, your specific gravity would go down as you have just added 5 gallons of freshwater to your system.

You follow me?

 

Yes I follow but that is not a certainty that is an IF and a big if.

This SG question would be in the area of normal tank situations on EVAPORATION and SG or salinity dropping because of evaporation. Bottom line evaporation has nothing to do with the rise or falling of SG or salinity because it does not evaporate.

Also if you use a 2 part additive like B-Ionic or CalxMax or any other 2 parter the SG will go up as it does add some salt.

 

Not a big if really. If you drip and drip too fast, you can do it too over time.

This has been my experience, especially with small tanks.

Evaporation has everything to do with SG. Remove your float switch or I.V.
Use your refrac or hydrometer, right down the number it gives you, then go out of town for a week. When you come back, test again and right down the number.

 

Matt you have not taken any salt out of the tank so it can not effect it.
! gallon evaporates and you add 1 gallon from top off system... hince no change.

 

Dude, reread my last post.  
I said in that example you are not replacing the evaporated water while you are gone. By not doing so, I am showing that evap has something to do with SG.

 

Dude read all the posts.... this is a normal situation not a crystal ball thing that COULD happen. There are alot of coulds if's but's. This is a normal situation with equipment running correctly.

You could throw in all kinds of different scenarios that could, would, maybe, if, but. We all do our best to avoid these but we are talking NORMAL day to day evaporation here.

Chill and admit you were wrong.

 

These scenarios - evaporation, dripping too fast, etc.. happen to me, happen to everyone.

Sorry bud. All I can say is you are hung up on total amount of salt and not thinking much about the relationship - total salt / total water volume.

 

Sure I am but you are putting in a situation that MAY happen once in a life time. We are talking evap and dripping and unless as you say you dump 10 gallons of fresh water in the tank SG or salinity will not change which in your case happened when away from the tank.
5 gallons in 1 day (on my 80 gallon tank) would only change the SG or salinity from 1.025 to 1.024 or 1.023 at worse case scenario. this would NOT be and every day event. If it were then the setup would need some serious changes. You are being paranoid about this and how many times has this happened? once maybe?
I understand your scenario but it is not common.

 

Once in a life time? Well maybe it's just common to me. And my tank is only 15 gallons. Not everyone has an 80 gallon tank.  

Plus this tank and the last were open tops, so evap is happening pretty fast.

Back to you big guy. [smiley=finger1.gif] [smiley=party014.gif]

I am getting a beer.

 

[quote author=Matt Rogers link=board=Water;numb=1077872753;start=105#114 date=04/03/04 at 18:08:56]Dude, reread my last post.  
I said in that example you are not replacing the evaporated water while you are gone. By not doing so, I am showing that evap has something to do with SG.[/quote]
OK even if not replacing the water you will still have the same amount of salt in the water because IT DOES NOT EVAPORATE. No salt removal and your salinity or SG stays the same or goes up a hair. But not enough to see on a fratometer.