Salinity INCREASE

[Freenow54]

So I only add Rodi Water to make up for Evaporation. I was going to do a Water change but I neglected the tank too long doing other projects. When I looked the sump return chamber was almost empty so I added about 2 gallons of Rodi. Just because I checked the Salinity it was 1.028. I need advice to stop this to me strange result please # reefsquad

 

[Macropharyngodon]

So I only add Rodi Water to make up for Evaporation. I was going to do a Water change but I neglected the tank too long doing other projects. When I looked the sump return chamber was almost empty so I added about 2 gallons of Rodi. Just because I checked the Salinity it was 1.028. I need advice to stop this to me strange result please # reefsquad

Uhh, Are you adding RODI saltwater? Because you need to add FW if you want to counteract evaporation. (You prolly know that, I just dunno what the problem would be other than that)

 

[Gumbies R Us]

This might sound stupid, so forgive me. Are you topping off water with the same bucket you mix saltwater in? I one time used a bucket i previously mixed saltwater in and forgot to rinse it out and it caused my salinity to go up.

 

[Freenow54]

No I have two 35 gallon Containers one straight up Rodi unmixed which is what I use .

 

[vetteguy53081]

So I only add Rodi Water to make up for Evaporation. I was going to do a Water change but I neglected the tank too long doing other projects. When I looked the sump return chamber was almost empty so I added about 2 gallons of Rodi. Just because I checked the Salinity it was 1.028. I need advice to stop this to me strange result please # reefsquad

This would be correct to offset high salinity but also assure you are not getting false readings ( calibrate unit).
Likely increasing from evaporation

 

[X-37B]

So I only add Rodi Water to make up for Evaporation. I was going to do a Water change but I neglected the tank too long doing other projects. When I looked the sump return chamber was almost empty so I added about 2 gallons of Rodi. Just because I checked the Salinity it was 1.028. I need advice to stop this to me strange result please # reefsquad

Are you using an ato or doing manual top offs?

 

[Freenow54]

This would be correct to offset high salinity but also assure you are not getting false readings ( calibrate unit).
Likely increasing from evaporation

I understand the evaporation effect, and my unit is calibrated but after adding 2 gallons of fresh Rodi waiting for over an Hour I expected a better reading. I did not do a reading at the beginning

 

[Freenow54]

Are you using an ato or doing manual top offs?

Manual in the sump

 

[X-37B]

Manual in the sump

That's the issue. Get an ato for stability.

 

[Freenow54]

That's the issue. Get an ato for stability.

Please explain why

 

[Kooma]

Please explain why

2 gallons top up means you don’t top if for a day or more. Adding 2 gallons of freshwater causes salinity to drop and shocks coral and fish.

Auto top offs add a few cups of water many times a day as needed. You don’t need to forget it, or remember to do it. Fill a 5 gallon pail under the tank with rodi water and walk away until it’s empty.

Auto top offs should be a requirement for a reef tank just like a light is.

 

[chip shop]

Are you dosing

 

[X-37B]

Please explain why

Reefing 101. Stability. An ato keeps specific gravity constant.
Ocean 1.0264.
My sg runs 1.026-1.027.

 

[Freenow54]

2 gallons top up means you don’t top if for a day or more. Adding 2 gallons of freshwater causes salinity to drop and shocks coral and fish.

Auto top offs add a few cups of water many times a day as needed. You don’t need to forget it, or remember to do it. Fill a 5 gallon pail under the tank with rodi water and walk away until it’s empty.

Auto top offs should be a requirement for a reef tank just like a light is.

I understand that. The Salinity increased from 1,024 to 1.028 after adding 2 gallons of straight Rodi not dropped

 

[Nano_Man]

Auto top up does keep salinity stable . You can even do DIY bottle auto top up . Draw a line on the sump when you're levels are ok . When the water line drops below that line you know to top back up to the line . Mi

 

[Freenow54]

Reefing 101. Stability. An ato keeps specific gravity constant.
Ocean 1.0264.
My sg runs 1.026-1.027.

Still does not answer my first Question of jump Up in salinity not down

 

[KStatefan]

I understand that. The Salinity increased from 1,024 to 1.028 after adding 2 gallons of straight Rodi not dropped

Measurement error.

 

[Nano_Man]

I understand that. The Salinity increased from 1,024 to 1.028 after adding 2 gallons of straight Rodi not dropped

Yes that is weird any rodi water should alter your salinity should drop . Have you got a hydrometer they are the best thing for a true reading

 

[Freenow54]

Measurement error.

no

 

[Freenow54]

Yes that is weird any rodi water should alter your salinity should drop . Have you got a hydrometer they are the best thing for a true reading

yes an calibrated