Could someone check my math?

[Feet4Fish]

I am designing a new water mixing station. This is for a fish only set up that will run at 26 ppt (1.020 SG). I want to design it that I can throw one 50 gallon bag in and have hit mis up to that salinity. What water volume is needed? I figured it to be 61.5 gallons with a 50 gallon salt bag to make 26-27 ppt saltwater. Can anyone double check that for me?

 

[redfishbluefish]

Need to know whose salt you're using, and what they say their salt mixes up to as far as specific gravity.

 

[redfishbluefish]

As an example, I use Instant Ocean and they claim their salt mixed to the specified gallons will result in 1.022 SG (29.2 ppt).

 

[Feet4Fish]

Same here. Will be using instant ocean. Think my math is off if one nag in 50 gallons would equal 29.2 ppt

 

[ScottR]

Every salt mixes differently. Even the same brand can vary from bucket to bucket. You’ll need to mix and adjust. Even when I make small batches, it’s hit or miss and I need to adjust.

 

[redfishbluefish]

As @ScottR pointed out, you still might have to do some fine adjustment. So what you'll need is roughly 12% more water.....on a 50 gallon bag, 56 gallons of water to go from 29.2 to 26 ppm. (Check my math! :D)

One note of caution, don't literally dump the salt into the water. This will cause for environments of high alk/calc while it starts to mix which could cause for precipitation. You want to add the salt to very rapidly mixing water, like you're salting popcorn.

 

[Feet4Fish]

As @ScottR pointed out, you still might have to do some fine adjustment. So what you'll need is roughly 12% more water.....on a 50 gallon bag, 56 gallons of water to go from 29.2 to 26 ppm. (Check my math! :D)

One note of caution, don't literally dump the salt into the water. This will cause for environments of high alk/calc while it starts to mix which could cause for precipitation. You want to add the salt to very rapidly mixing water, like you're salting popcorn.

Thanks again @ScottR and @redfishbluefish for the help! Think I will go with a couple 120 gallon containers. My goal is 100 gallon change every 2 weeks (or maybe monthly). Will take account any fine adjustments needed but being fish only and only doing 100 gallons just the ballpark of 26 ppt would be fine. Total water volume is hovering around 800 gallons.