how to reduce salinity?

[Fishlip]

I bought water at LFS and my salinity was at 1.026, 3 days later and its at 1.028. What happened? And how can I reduce it? IS adding RO the only way to go?

 

[htsou]

take out some salt water and fill some RO

 

[AJ69]

Take out like 5 gal and replace them with fresh RO.

 

[kau_cinta_ku]

i have a feeling that your water just evaporated which is why your salt jumped up. remember water evaporates not salt. just replace the evaporated water with ro water and it should come back down. i use a piece of tape to mark where my water level is so i always know how much evaporated water to replace so the sg stays a constant 1.026

 

[Scuba Oz]

Make sure the device you are using to measure the salinity is accurate also, but as stated make sure you are topped off with RO/DI water and if still high pull some out and replace with RO/DI water until desired results are obtained.

 

[Fishlip]

can I replace it just with DI?

 

[bertoni]

Evaporated water should be replaced with fresh water, and RO-DI or DI water should be fine. I wouldn't change the SG more than 0.001 units every other day or so, though. Autotopoff can save a lot of work, IME.

 

[Dastank]

I use ocean water and have the same trouble. I have to mix a little RO water in all the time to keep the salinity down.

 

[rjwilson37]

Bringing the salinity down from 1.028 to 1.026 is not very stresful to the fish, it is salinity going up quickly from 1.026 to 1.028 that is not good for them. The tanks gravity increasing stresses them out a bit more because it makes it harder for them to move around than it did before the change, than the gravity going down which makes it easier for them to move around. Easier is less stresful to them than harder, but saltwater critter's don't like big changes and .002 is a big change for them.

Just like Bertoni said, bring it down to 1.027 today and then on Tuesday try and bring it down to 1.026.