Top off
- Thread starter ffiel2
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Chris Adams
Valuable Member
Your SG will does not drop due to top off.
More likely cause would be making up water at 1.021 and doing a water change on a tank that was running 1.026. Of course this depends on tank size, and volume of WC done etc.
Maybe if you had extreme salt creep but that would take some time.
Also maybe if you had crack in tank, or sump and were losing water slowly then maybe I could see reduced SG also.
So what I am saying is something is either of with your test(do you use hydrometer, probe, refractometer?). Or you did a WC and you SG was off a good amount.
Just my opinion.
More likely cause would be making up water at 1.021 and doing a water change on a tank that was running 1.026. Of course this depends on tank size, and volume of WC done etc.
Maybe if you had extreme salt creep but that would take some time.
Also maybe if you had crack in tank, or sump and were losing water slowly then maybe I could see reduced SG also.
So what I am saying is something is either of with your test(do you use hydrometer, probe, refractometer?). Or you did a WC and you SG was off a good amount.
Just my opinion.
Daytonareefing
Active Member
I mark my tank or sump with a marker after its filled and the SG is where I want it. Them when the water in the sump falls below that line which for me is about a 1/2" a day I then fill it back up to that mark with RO water. I assume you just put more water in because they said to and you were not replacing what had evaporated because the salt will stay the same you just add fresh RO when it evaporates.
steve&mari
Blessed Reefer
That's really odd salt doesn't evaporate so as evaporation happens salinity climbs. Top off with ro/di keeps it stable by less severe swings by topping off as waters lost. By hand it tends to be more loss between top offs n bigger swings. When replacing only the amount of evaporation it shouldn't drop a drop would indicate too much ro/di is being added according to logic. how do you check salinity. Is tool used calibrated properly. 1.024 is fine but most keep it about 1.025-1.026 the slight drop isn't drastic enough to be a big issue. Why it's dropping is.
steve&mari
Blessed Reefer
Good point about a wc n mix being off some.
Chris Adams
Valuable Member
This is good point also. If you put more than evaporated that could be effect also.
